To swim like a fish = to swim well
The idiom “swim like a fish” is a common phrase native English speakers like to use when a person is very good at swimming. They have a lot of talent.
When you talk about a person who swims very well, you may say that they swim like a fish.
Read the dialogue and take the quiz below to test your comprehension.
Lucy: Did you see Derek at the pool yesterday?
Jack: Yes, I did.
Lucy: He swims like a fish. I was surprised.
Jack: I am not surprised. He is taking swimming lessons.
Talk about it: Talk about a person who swims well. Use the idiom “swims like a fish”.