Definition of sinker noun from the Oxford Advanced American Dictionary

     

    sinker

     noun
    noun
    NAmE//ˈsɪŋkər//
     
     
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  1. 1a weight that is attached to a fishing line or net to keep it under the water
  2. 2 (also sinker ball) (in baseball) a type of pitch that drops lower when it reaches the batter He kept throwing sinkers.
  3. Idioms
    hook, line, and sinker
     
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    completely What I said wasn't true, but he fell for it (= believed it) hook, line, and sinker.
See the Oxford Advanced Learner's Dictionary entry: sinker

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