1fish 
/ˈfɪʃ/ noun
plural fish or fish·es /ˈfɪʃ/ noun 1 [count] : a cold-blooded animal that lives in water, breathes with gills, and usually has fins and scales
▪ a small fish ▪ an ocean/river fish [=a kind of fish that lives in an ocean/river] — see color picture 2 [noncount] : the meat of a fish eaten as food
▪ We're having fish for dinner.
▪ a small fish ▪ an ocean/river fish [=a kind of fish that lives in an ocean/river] — see color picture
usage When you are talking about more than one fish, the plural fish is more commonly used than fishes.
▪ We caught several fish. When you are talking about more than one kind or species of fish, both fishes and fish are used. ▪ varieties of tropical fish ▪ all the fishes of the sea
▪ We caught several fish. When you are talking about more than one kind or species of fish, both fishes and fish are used. ▪ varieties of tropical fish ▪ all the fishes of the sea
▪ We're having fish for dinner.
a big fish in a small pond (chiefly US) or Brit a big fish in a little pond
: a person who is very well known or important in a small group of people but who is not known or important outside that group
▪ In school he was a big fish in a small pond, but once he moved to the city he was just another struggling actor.
▪ In school he was a big fish in a small pond, but once he moved to the city he was just another struggling actor.
a fish out of water
: a person who is in a place or situation that seems unnatural or uncomfortable
▪ He's a small-town boy who feels like a fish out of water here in the big city.
▪ He's a small-town boy who feels like a fish out of water here in the big city.
drink like a fish — see 1drink
fish in the sea
informal — used to say that there are many more people available for a romantic relationship ▪ “I know you're sad because you and your boyfriend broke up, but he's not the only fish in the sea.” “You're right. There are many/plenty more fish in the sea.”
fish to fry
informal : things to do or deal with
▪ We'll have to address that problem tomorrow. Right now we've got other/bigger fish to fry. [=we've got other/bigger problems that we need to give our attention to]
▪ We'll have to address that problem tomorrow. Right now we've got other/bigger fish to fry. [=we've got other/bigger problems that we need to give our attention to]
neither fish nor fowl
: a person or thing that does not belong to a particular class or category
▪ The movie is neither fish nor fowl—it's not really a comedy, but it's too lighthearted to be called a drama.
▪ The movie is neither fish nor fowl—it's not really a comedy, but it's too lighthearted to be called a drama.
odd/queer fish
Brit, informal : a strange or unusual person
▪ She's really quite an odd fish.
▪ She's really quite an odd fish.
— fish·less /ˈfɪʃləs/ adjective
▪ a fishless lake
/ˈfɪʃləs/ adjective ▪ a fishless lake
— fish·like /ˈfɪsˌlaɪk/ adjective
▪ a fishlike tail
/ˈfɪsˌlaɪk/ adjective ▪ a fishlike tail
