shark

Từ điển Oxford Advanced Learner 8th

shark [shark sharks] BrE [ʃɑːk] NAmE [ʃɑːrk] noun
1. a large sea fish with very sharp teeth and a pointed ↑fin on its back. There are several types of shark, some of which can attack people swimming
•a Great White Shark
•a fatal shark attack
2. (informal, disapproving)a person who is dishonest in business, especially sb who gives bad advice and gets people to pay too much for sth
see also ↑loan shark

Word Origin:
sense 1 late Middle English sense 2 late 16th cent. German Schurke ‘worthless rogue’ ↑shark

Example Bank:
•The boat went down in shark-infested waters off the coast of South Africa.
•The dark shapes of half a dozen sharks circled beneath the boat.