Definition of coin verb from the Oxford Advanced American Dictionary

     

    coin

     verb
    verb
    NAmE//kɔɪn//
     
    Verb Forms present simple I / you / we / they coin
     
    he / she / it coins
     
    past simple coined
     
    -ing form coining
     
     
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  1. 1coin something to invent a new word or phrase that other people then begin to use Who coined the term “Generation X”?
  2. 2coin something to make coins out of metal
  3. Idioms
      to coin a phrase
       
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    1. 1used to show that you are aware that you are using an expression that is not new Oh well, no news is good news, to coin a phrase.
    2. 2 used to introduce a well-known expression that you have changed slightly in order to be funny Tasting is believing, to coin a phrase! (= the usual phrase is “seeing is believing”).
See the Oxford Advanced Learner's Dictionary entry: coin