From Longman Dictionary of Contemporary Englishdumbbelldumb‧bell /ˈdʌmbel/ noun [countable] 1 DSOtwo weights connected by a short bar, that you can lift to strengthen your arms and shoulders SYN weights2 STUPID/NOT INTELLIGENT American English informal someone who is stupid
Examples from the Corpus
dumbbell• He had undressed forty-five-pound weight bars, stacked plates, and dumbbells on the floor.• Rigoulet, the strong man, strains at his dumbbell.• I raised it, as some sweating weight lifter might raise above his head his dumbbells of iron.• Slowly straighten the arm by lifting the dumbbell backwards, keeping the upper arm still.• Dumb-bell curls should always involve rotation of the dumbbells.• He works out with dumbbells in the prison gym. 