fish
I
 /ˈfıʃ/  noun  ,  pl   fish  or   fish·es
  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]
  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
  2 [  noncount  ] : the meat of a fish eaten as food
   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.
  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.
  drink like a fish — see drink, 1
  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]
  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.
  odd/queer fish
    Brit    informal   : a strange or unusual person
    She's really quite an odd fish.
 — see also cold fish, kettle of fish at kettle
  fish·less /ˈfıʃləs/  adj  
   a fishless lake
  fish·like /ˈfısˌlaık/  adj  
   a fishlike tail
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II
  verb  , fish·es, fished, fish·ing
  1 a [  no obj  ] : to catch or try to catch fish
   I love to fish.
   We spent the afternoon fishing for trout.
  1 b [  + obj  ] : to catch or try to catch fish in (a river, stream, etc.)
   They fished the stream all morning.
  2 [  no obj  ] : to search for something by feeling : to use your hand to try to find something
   She was fishing around in her purse for her keys.
  fish for [  phrasal verb  ]
   fish for (something) : to ask for or try to get (something, such as praise or attention) in an indirect way
    I think he offers apologies for his cooking as a way of fishing for compliments. [=as a way of getting people to say that they like the food he cooks]
    fishing for answers
  fish or cut bait
    US    informal   : to stop hesitating and choose to do or not do something
    It's time for the company to fish or cut bait. We either take the job or turn it down.
  fish out [  phrasal verb  ]
   fish (something) out or fish out (something)
   1 : to pull (something) out of water or some other liquid
    The police fished the car out of the harbor.
    She fished the sugar packet out of her iced tea.
   2 : to pull (something) out from a container, bag, etc.
    She reached into her purse and fished out her keys.