拿 dumb 來罵人
和核心畫面之間只隔著那塊鐵給人的印象：重、實心、裡面什麼也沒有。
noun · B2
A stupid person. This is an insult; it is informal, and the dictionaries here mark it as American English.
笨蛋
核心畫面
Think of a bell that makes no sound. Dumb here means silent, and bell is the ringing instrument, so the name says: all the weight, none of the noise. That is literally where it started — in sixteenth-century England the pulling movement on rigged weights that could not ring. What survived into today's word is the weight itself: a short bar with a solid lump of metal at each end, heavy in the hand, and completely silent inside.
dumbbell 可以想成一塊「不會出聲的鐘」。dumb 在這裡是不出聲，bell 是會響的鐘，合起來就是：重量都在…更多收起
dumbbell 可以想成一塊「不會出聲的鐘」。dumb 在這裡是不出聲，bell 是會響的鐘，合起來就是：重量都在，聲音沒有。這也真的是它的來歷——十六世紀英格蘭的敲鐘人，用一套拉起來不會響的配重器材練拉繩的動作。留到今天的是那份重量：一根短桿，兩端各一塊實心的鐵，握在手裡沉甸甸的，而且裡面安安靜靜。From the word’s history
From dumb (silent) plus bell. The term began in sixteenth-century England for silent practice apparatus that let bell-ringers rehearse the motion of ringing without any sound.
由 dumb（不出聲的）加 bell（鐘）組成。這個詞起於十六世紀的英格蘭，指一套讓敲鐘人練動作、但完全不會響的器材。
Wiktionary entry for dumbbell (packet evidence): From dumb (silent) + bell (a resonating instrument); 16th-century England, silent exercise apparatus used in practising the motions of ringing church bells noiselessly.
From the picture
Also in this word
noun · B1
A short bar with a weight fixed on each end, which you hold in one hand and lift to make your arms, shoulders and chest stronger.
啞鈴