Definitions from Wiktionary (shark)

▸ noun:  (ichthyology, countable) Any scaleless, predatory fish of the superorder Selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head.
▸ noun:  (uncountable) Flesh of this animal, consumed as food.
▸ noun:  (countable) Various other fishes that resemble true sharks in appearance and/or behaviour:
▸ noun:  (inexact) A ghost shark, also called a chimaera (any fish in order Chimaeriformes)
▸ noun:  (inexact) A spiny shark (any extinct fish in the paraphyletic grade †Acanthodii, which is also considered a class.)
▸ noun:  A freshwater shark.
▸ noun:  Any fish in the genus Epalzeorhynchos.
▸ noun:  Any fish in the genus Balantiocheilos.
▸ noun:  An iridescent shark (Pangasianodon hypophthalmus).
▸ noun:  A roseline shark (Dawkinsia denisonii).
▸ noun:  A paroon shark (Pangasius sanitwongsei).
▸ noun:  (countable) A noctuid moth of species Cucullia umbratica.
▸ noun:  (UK, university slang, countable) A university student who is not a fresher that has engaged in sexual activity with a fresher; usually habitually and with multiple people.
▸ verb:  (rare) To fish for sharks.
▸ verb:  (UK, university slang) Of a university student who is not a fresher: to engage in sexual activity with a fresher, or to be at a bar or club with the general intention of engaging in such activity.
▸ noun:  Someone who exploits others, for example by trickery, lies, usury, extortion.
▸ noun:  (informal, derogatory) A sleazy and amoral lawyer.
▸ noun:  (informal, derogatory) An ambulance chaser.
▸ noun:  (informal) A relentless and resolute person or group, especially in business.
▸ noun:  A person that excels in a particular field.
▸ noun:  (informal) A very good poker or pool player. Compare fish (a bad poker player).
▸ noun:  (sports and games) A person who feigns ineptitude to win money from others.
▸ verb:  (obsolete) To steal or obtain through fraud.
▸ verb:  (obsolete, intransitive) To play the petty thief; to practice fraud or trickery; to swindle.
▸ verb:  (obsolete, intransitive) To live by shifts and stratagems.
▸ verb:  (obsolete) To pick or gather indiscriminately or covertly.

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