sea
A very big area of salt water, bigger than a lake, like the ocean.
A large body of salt water that covers most of the Earth's surface and surrounds its landmasses.
A very big number or amount of something, like a crowd or things all together.
A very large amount of something, often appearing like a continuous surface or crowd.
- Base: sea
- Plural: sea, seas
a sea change
1Major transformation
A big and important change in something.
- There has been a sea change in public opinion about climate change.
- Her attitude underwent a sea change after she traveled abroad.
at sea
1Confused or on a ship
On a ship at sea, or feeling very confused and not knowing what to do.
- We were at sea for three weeks before reaching land.
- I'm completely at sea with these new instructions.
lost at sea
1Missing at sea or confused
Not found after being at sea, or feeling very confused and without an idea what to do.
- Several sailors were lost at sea during the storm.
- When it comes to taxes, I'm lost at sea.
sea level
1Average ocean height for measurement
The average height of the surface of the ocean, used to measure how high land or mountains are.
- The city is 500 meters above sea level.
- Sea level has been rising due to climate change.