What is the meaning of Shark?

A scaleless, predatory fish of the superorder Selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head.

The noctuid moth Cucullia umbratica.

A university student who is not a fresher that has engaged in sexual activity with a fresher; usually habitually and with multiple people.

To fish for sharks.

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.

Someone who exploits others, for example by trickery, lies, usury, extortion.

A sleazy and amoral lawyer.

An ambulance chaser.

A relentless and resolute person or group, especially in business.

A very good poker or pool player. Compare fish (a bad poker player).

A person who feigns ineptitude to win money from others.

To steal or obtain through fraud.

To play the petty thief; to practice fraud or trickery; to swindle.

To live by shifts and stratagems.

To pick or gather indiscriminately or covertly.

shepherd's vest

shell (of certain fruits like nuts, hazel, chestnut etc)

skin (that covers the seed of certain fruits like peach, grape, prunes etc)

snake skin

shark

Source: wiktionary.org