A very large spotted shark, Rhincodon typus, of warm marine waters, similar to a whale, that feeds by filtering plankton from the water.

Either of two powerful mackerel sharks of the genus Isurus, having a large heavy body, a sharp nose and a nearly symmetrical tail, found in southern oceans.

A very large shark, Cetorhinus maximus, that feeds at or close to the surface by filtering plankton from the water and is found in all the world's temperate oceans.

Any of various bottom-dwelling sharks of the family Ginglymostomatidae that have two fleshy barbels hanging from the lower jaw. / (formerly) Any small shark; a dogfish.

A large shark, Galeocerdo cuvier, of wide warm-water distribution, that hunts alone and has dark stripes across its back.

Used other than figuratively or idiomatically: see shark, baiter. / (Australia, colloquial) A lone swimmer or surfer far from shore; shark bait.

(humorous) One who has been, or is likely to be, attacked by a shark. / (humorous, by extension) One who is in a precarious or vulnerable position; a dead duck.

A small shark, Isistius brasiliensis, that tears circular chunks of flesh from its prey.

(idiomatic) To operate among dangerous people.

A shark, Carcharhinus leucas, that is common in both temperate and tropical coastal waters.