a big fish in a small pond
someone who is important or powerful only because there are not many other people competing with them
(小圈子里的)大人物，小池塘中的大魚
a cold fish
someone who is not friendly
冷漠無情的人
drink like a fish
To drink a lot of alcohol regularly
（習(xí)慣性）飲酒過度，酗酒
a fish out of water
Someone who is in a situation that they know nothing about or are not used to
在陌生環(huán)境不得其所的人
have bigger/other fish to fry
to have more important things to do or think about
還有更重要的事情要做
neither fish nor fowl
used for saying that you do not know what something is
非驢非馬；不倫不類
There are plenty more fish in the sea.
Used for telling someone whose boyfriend or girlfriend has left them that they will soon have another relationship.
天涯何處無芳草
someone who is important or powerful only because there are not many other people competing with them
(小圈子里的)大人物，小池塘中的大魚
a cold fish
someone who is not friendly
冷漠無情的人
drink like a fish
To drink a lot of alcohol regularly
（習(xí)慣性）飲酒過度，酗酒
a fish out of water
Someone who is in a situation that they know nothing about or are not used to
在陌生環(huán)境不得其所的人
have bigger/other fish to fry
to have more important things to do or think about
還有更重要的事情要做
neither fish nor fowl
used for saying that you do not know what something is
非驢非馬；不倫不類
There are plenty more fish in the sea.
Used for telling someone whose boyfriend or girlfriend has left them that they will soon have another relationship.
天涯何處無芳草