noun.an aquatic animal —usually used in combination

• freshwater fish
• tropical fish

noun.any of numerous cold-blooded strictly aquatic craniate vertebrates that include the bony fishes and usually the cartilaginous and jawless fishes and that have typically an elongated somewhat spindle-shaped body terminating in a broad caudal fin, limbs in the form of fins when present at all, and a 2-chambered heart by which blood is sent through thoracic gills to be oxygenated

• We're having fish for dinner.
• an odd fish

noun.the flesh of fish used as food

• felt sorry for the poor fish
• The submarine's fish hit the freighter.

verb.to catch or attempt to catch fish

• fishing for a compliment
• fish for pearls

verb.to seek something by roundabout means

• fishing around in her purse for her keys
• fishing the stream

verb.to search for something underwater

• Fishing a fly … often produces a series of multiple hits …
• fish salmon