a gymnastic apparatus consisting of two wooden or metal balls connected by a short bar serving as a handle, used as a weight for exercising.
a stupid person.
dunce, ignoramus, fool, blockhead, dimwit.
an exercising weight consisting of a single bar with a heavy ball or disc at either end
a small wooden object shaped like this used in dog training for the dog to retrieve
) a fool
Collins English Dictionary - Complete & Unabridged 10th Edition
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I'm afraid I come on like a dumbbell sometimes.]]>
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Dictionary of American Slang and Colloquial Expressions
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.
He says that with each vibration, the dumbbell catches on the spacetime fabric and pushes itself up a tiny bit.
To increase difficulty, hold a dumbbell or free-weight plate.
Not the heavy, raging body-building type, but dumbbell free weight lifting.
Anyone who can hoist a dumbbell and print a business card on a home computer can call him or herself a personal trainer.
Machine weights are only a modified version of the bar and dumbbell.