0 a large fish that has sharp teeth and a pointed fin on its back:
a basking shark
The movie "Jaws" is about a man-eating shark.
1 a dishonest person, especially one who persuades other people to pay too much money for something:
2 a type of large fish that has rows of sharp teeth
a loan shark
3 a dishonest person, especially one who persuades other people to pay too much money for something:
We could see the fin of a shark as it slowly circled our boat.
Some species of shark are now endangered.