Definition of coin verb from the Oxford Advanced Learner's Dictionary

     

    coin

     verb
    verb
    BrE BrE//kɔɪn//
     
    ; NAmE NAmE//kɔɪn//
     
    Verb Forms present simple I / you / we / they coin
    BrE BrE//kɔɪn//
     
    ; NAmE NAmE//kɔɪn//
     
    he / she / it coins
    BrE BrE//kɔɪnz//
     
    ; NAmE NAmE//kɔɪnz//
     
    past simple coined
    BrE BrE//kɔɪnd//
     
    ; NAmE NAmE//kɔɪnd//
     
    past participle coined
    BrE BrE//kɔɪnd//
     
    ; NAmE NAmE//kɔɪnd//
     
    -ing form coining
    BrE BrE//ˈkɔɪnɪŋ//
     
    ; NAmE NAmE//ˈkɔɪnɪŋ//
     
     
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  1. 1coin something to invent a new word or phrase that other people then begin to use The term ‘cardboard city’ was coined to describe communities of homeless people living in cardboard boxes. He was the first to coin the motto ‘Make Love, Not War’.
  2. 2coin something to make coins out of metal
  3. Word Origin Middle English: from Old French coin ‘wedge, corner, die’, coigner ‘to mint’, from Latin cuneus ‘wedge’. The original sense was ‘cornerstone’, later ‘angle or wedge’ (senses now spelled quoin); in late Middle English the term denoted a die for stamping money, or a piece of money produced by such a die.Idioms
    be coining it (in), be coining money
     
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    (British English, informal) to earn a lot of money quickly or easily synonym rake in
    1. 1used 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’).
    2. 2used 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.
See the Oxford Advanced American Dictionary entry: coin