Definition of rod noun from the Oxford Advanced American Dictionary

     

    rod

     noun
    noun
    NAmE//rɑd//
     
     
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  1. 1(often used in compounds) a long straight piece of wood, metal, or glass see also lightning rod
  2. 2= fishing rod fishing with rod and line
  3. 3the rod (old-fashioned) a stick that is used for hitting people as a punishment There used to be a saying: “Spare the rod and spoil the child.”
  4. 4 (slang) a small gun
  5. Idioms
    a rod/stick to beat somebody with
     
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    a fact, an argument, etc. that is used in order to blame or punish someone
See the Oxford Advanced Learner's Dictionary entry: rod