Definition of shark noun from the Oxford Advanced American Dictionary

     

    shark

     noun
    noun
    NAmE//ʃɑrk//
     
     
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  1. 1a large sea fish with very sharp teeth and a pointed fin on its back. There are several types of sharks, some of which can attack people swimming. a Great White Shark a fatal shark attack
  2. 2(informal) (disapproving) a person who is dishonest in business, especially someone who gives bad advice and gets people to pay too much for something see also loan shark
See the Oxford Advanced Learner's Dictionary entry: shark