名詞 dumbbell:

1. an exercising weight; two spheres connected by a short bar that serves as a handle
2. an ignorant or foolish person
   同義詞：dummy, dope, boob, booby, pinhead

dumb.bell

n.（名詞）
A weight consisting of a short bar with a metal ball or disk at each end that is lifted for muscular development and exercise.
啞鈴：短柄兩端各有一金屬球或盤的重物，用來舉起以發(fā)展和鍛煉肌肉
Slang A person regarded as stupid.
【俚語】 笨蛋

來源：
[From an apparatus similar to that used in ringing a church bell, but without the bell, used for practice or physical exercise]
[來自一種類似教堂敲鐘用具的器具，但無鈴，用來進行身體鍛練]