"weighted bar used for exercise," 1711, originally an apparatus like that used to ring a church bell, but without the bell (hence dumb); used for exercise but sometimes also to practice ringing changes. Figurative sense of "blockhead, stupid person" attested by 1918, American English college slang.
权威例句
1. Stand with feet hip - width apart, a dumbbell in each hand.
双脚分开与臀部齐宽, 左右手各握一哑铃.
2. The dumbbell was raised 20 times by the sportsman yesterday.
昨天,这个哑铃被运动员举起二十次.
3. The dumbbell will be raised 20 times by the sportsman tomorrow.
明天,这个哑铃将被运动员举起二十次.
4. Dumbbell is to make you strong change in the best helper.
哑铃是使你变强壮的最佳帮手.
5. The dumbbell is raised 20 times by the sportsman everyday.