Definition of shark noun from the Oxford Advanced Learner's Dictionary

     

    shark

     noun
    noun
    BrE BrE//ʃɑːk//
     
    ; NAmE NAmE//ʃɑːrk//
     
    Fish, Business people
     
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  1. 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 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. See related entries: Fish
  2. 2(informal, disapproving) a person who is dishonest in business, especially somebody who gives bad advice and gets people to pay too much for something see also loan shark See related entries: Business people
  3. Word Origin sense 1 late Middle English: of unknown origin. sense 2 late 16th cent.: perhaps from German Schurke ‘worthless rogue’, influenced by shark, the animal.
See the Oxford Advanced American Dictionary entry: shark