Definition of dumb-bell noun from the Oxford Advanced Learner's Dictionary

     

    dumb-bell

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1a short bar with a weight at each end, used for making the arm and shoulder muscles stronger
  2. 2(North American English, informal) a stupid person
  3. Word Origin early 18th cent.: originally denoting an apparatus similar to that used to ring a church bell (but without the bell, so noiseless or “dumb”); sense (2) (dating from the 1920s) is an extended use by association with dumb ‘stupid’.