assert
gb/əsˈɚt/ us/əsˈɚt/
B2
English
~ 5300
Senses
0 senses
Verb
formal
C1
action
1
state something firmly as true
To say strongly that something is true.
Usage pattern:
to assert that [clause]
Common mistake:
Learners sometimes use 'assert' for physical actions (e.g., *"He asserted the door"*), but it is only used for statements, beliefs, rights, or power. Another common mistake is using an infinitive instead of a clause, as in *"She asserted to be innocent"*; the correct pattern is *"She asserted that she was innocent"*.
Synonyms
claim (More general; does not always suggest strong confidence or forcefulness.)
|
maintain (Often suggests continuing to assert something over time, even when others disagree.)
|
contend (Common in formal or academic writing; highlights disagreement or debate.)
|
state (More neutral; lacks the idea of forcefulness that 'assert' carries.)
Antonyms
deny (Opposite because it means to say that something is not true.)
|
question (Opposite in attitude; instead of stating something as true, you express doubt about it.)
Collocations
assert that
|firmly assert
|assert his innocence
|assert the opposite
|publicly assert
Themes
communication
|opinions
|law
Examples
- The company asserted that the product was completely safe.
- He firmly asserted his belief that the policy would fail.
- Several witnesses asserted that they had seen the suspect near the scene.
- The minister asserted that the government had acted legally at all times.
- In her article, she asserts that social media has changed the way we think.
Learner examples
- The teacher asserted that the test was fair.
- She asserted that she did nothing wrong.
- The doctor asserted that the medicine was safe to use.
- He asserted that the story was true.
- The manager asserted that the team could meet the deadline.
Verb
B2
action
2
behave confidently so others respect you
To act or speak with confidence so other people listen to you and respect you.
Usage pattern:
to assert [oneself]
Common mistake:
Learners sometimes say *"He is an assert himself person"* instead of using the adjective 'assertive', or they confuse 'assert yourself' with 'introduce yourself'. 'Assert yourself' means to show confidence, not simply to say your name.
Synonyms
stand up for yourself (More informal and conversational; focuses on defending your needs and rights.)
|
be assertive (Adjectival phrase describing a general personality trait rather than a single act.)
Antonyms
back down (Means to withdraw or stop fighting for your position, the opposite of asserting yourself.)
|
submit (Means to accept another's control or opinion without resistance.)
Collocations
assert yourself
|learn to assert yourself
|assert yourself at work
|assert yourself more
|have trouble asserting yourself
Themes
personality
|work
|relationships
|communication
Examples
- If you don't assert yourself in meetings, your ideas may never be heard.
- She began to assert herself more after taking a leadership course.
- Teenagers often struggle to assert themselves with their parents.
- In some workplaces, women still have to assert themselves to be taken seriously.
- He is quiet, but he knows how to assert himself when it really matters.
Learner examples
- You need to assert yourself in class and ask questions.
- She is shy, but she is learning to assert herself.
- At his new job, he finds it hard to assert himself.
- My coach told me to assert myself on the field.
- He could not assert himself in the group, so nobody heard his idea.
Verb
formal
C1
action
3
use or defend rights or power
To strongly use or protect your rights, power, or control.
Usage pattern:
to assert [rights/authority/control]
Common mistake:
Learners sometimes confuse this use with simply 'having' rights or power and say *"They have to assert for their rights"*. The verb does not take 'for' here; the correct structure is *"assert their rights"*.
Synonyms
exercise (Often used with 'rights' or 'authority'; focuses on using what you have.)
|
enforce (Emphasizes making others obey or accept your rights or authority.)
Antonyms
relinquish (Means to give up rights or power, the opposite of asserting them.)
|
submit (Means to yield to someone else's control instead of asserting your own.)
Collocations
assert your rights
|assert authority
|assert dominance
|assert control
|assert independence
Themes
law
|power
|politics
|communication
Examples
- Citizens must be willing to assert their rights when they are violated.
- The new manager quickly asserted her authority over the team.
- The country began to assert its independence on the international stage.
- He asserted control over the project after months of confusion.
- The group used social media to assert its influence in the debate.
Learner examples
- Workers should assert their rights to fair pay.
- The teacher had to assert her authority in the noisy class.
- The small country tried to assert its independence from its neighbor.
- Parents sometimes need to assert control over their children.
- She asserted her right to take a break.
Verb
technical
C2
action
4
check a condition in code
In computer code, to test that something is true and stop the program if it is not.
Usage pattern:
to assert that [condition]
Synonyms
verify (General term for checking correctness; 'assert' is a specific programming operation.)
Antonyms
ignore (In this context, failing to check a condition or allowing errors to pass unnoticed.)
Collocations
assert condition
|assert statement
|assert true
|assert false
|assert function
Themes
technology
|science
Examples
- The test framework will assert that the returned value matches the expected result.
- You should assert that the input is not null before using it.
- In debug mode, the program asserts that the index is within range.
Learner examples
- The developer used a line of code to assert that the user ID was valid.
- This function asserts that the list is not empty.
- If the program asserts a false condition, it will stop and show an error.
Verb
technical
C2
action
5
formally claim a right in law
In legal situations, to officially say that you have a right or claim.
Usage pattern:
to assert [a claim/right]
Common mistake:
Learners may not realize that this is a specialized legal use and try to use it in everyday speech instead of simpler verbs like 'ask for' or 'say you have the right to'.
Synonyms
invoke (Legal term for calling on a right or law to support your position.)
|
allege (Means to claim or state, often before proof; not limited to rights.)
Antonyms
waive (Means to decide not to use a legal right, the opposite of asserting it.)
|
withdraw (Means to take back a claim or demand that was previously asserted.)
Collocations
assert a claim
|assert a right
|assert a defense
|assert legal ownership
|assert jurisdiction
Themes
law
|business
Examples
- The tenants asserted their right to remain in the building under the new law.
- The company asserted a claim for damages against its former supplier.
- The defendant failed to assert this defense at an earlier stage of the proceedings.
- The court held that the state could not assert jurisdiction over the foreign company.
- He asserted legal ownership of the property in his filing.
Learner examples
- The workers asserted a claim for unpaid wages.
- Her lawyer will assert her right to a fair trial.
- The company decided not to assert its legal rights in this case.
- They asserted a claim to the land in court.
- The state tried to assert jurisdiction over the foreign business.
Grammar
Dictionary form
assert
IPA
GB/əsˈɚt/
US/əsˈɚt/
Syllables & stress
as - sert (2 syllables)
Stress on 2nd syllable (sert)
Word forms
Verb
- Base: assert
- 3rd Person Singular: asserts
- Present Participle: asserting
- Past: asserted
Word family
Expressions
assert authority
1/əsˈɚt əθˈɔɹɪti/
fixed phrase
show and use one's authority
To act in a strong way so that people recognize and accept your power or position.
Examples
- The new coach had to assert his authority from the first day.
- Parents sometimes struggle to assert authority with older children.
- The judge asserted her authority to keep order in the courtroom.
assert control
1/əsˈɚt kəntɹˈoʊl/
fixed phrase
take and use firm control
To take strong control of a situation or group of people.
Examples
- The government moved quickly to assert control after the protests.
- The teacher had to assert control over the noisy class.
- The central bank asserted control over interest rates to calm the markets.
assert independence
1/əsˈɚt ˌɪndɪpˈɛndəns/
fixed phrase
show and claim independence
To act in a way that clearly shows you or your group are independent and make your own decisions.
Examples
- Teenagers often try to assert their independence from their parents.
- The region began to assert its independence after the conflict.
- She moved out to assert her independence and live on her own.
assert your rights
1/əsˈɚt jˈʊɹ ɹˈaɪts/
fixed phrase
use or demand your rights
To clearly and strongly use or demand the rights that you have.
Examples
- Employees are encouraged to assert their rights if they feel unsafe at work.
- Citizens must know the law in order to assert their rights.
- The group helps migrants understand and assert their rights.
assert yourself
1/əsˈɚt jʊɹsˈɛlf/
fixed phrase
behave confidently to gain respect
To act and speak with confidence so that other people listen to you and respect what you want.
Examples
- You have to assert yourself if you want a promotion.
- At university, she finally learned to assert herself in group discussions.
- If you don't assert yourself, people may take advantage of you.
assert dominance
1/əsˈɚt dˈɑmənəns/
fixed phrase
show and use greater power
To act in a way that makes it clear you have more power or control than others.
Examples
- The larger dog tried to assert dominance over the new puppy.
- The larger company asserted its dominance by buying up smaller competitors.
- The company used aggressive pricing to assert dominance in the market.
- He often raises his voice in meetings to assert dominance.
- He raised his voice to assert dominance in the conversation.