"shark" in the noun sense
any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
a person who is ruthless and greedy and dishonest
a person who is unusually skilled in certain ways
"a card shark"
"shark" in the verb sense
play the shark act with trickery
Source: WordNet® (An amazing lexical database of English)
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