Noun dumbbell has 2 senses
  1. dumbbell - an exercising weight; two spheres connected by a short bar that serves as a handle
    --1 is a kind of
    weight, free weight, exercising weight
  2. dumbbell, dummy, dope, boob, booby, pinhead - an ignorant or foolish person
    --2 is a kind of simpleton, simple
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