Read the dictionary definition of shark. All definitions for this word.
1. any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
2. a person who is unusually skilled in certain ways
1. a card shark
3. a person who is ruthless and greedy and dishonest
4. hunt shark
5. play the shark; act with trickery