a coin of the US and Canada worth ten cents （美国、加拿大的）十分硬币，十分钱 Word Originlate Middle English: from Old French disme, from Latin decima pars ‘tenth part’. The word originally denoted a tithe or tenth part; the modern sense ‘ten cent coin’ dates from the late 18th cent.
Idioms
a dime a dozen (North American English)
(British English two/ten a penny)
very common and therefore not valuable 普通得不值钱；（因常见而）价值低
drop a/the dime on somebody
- (North American English, informal)
to tell the police or people in authority that somebody has done something wrong 一角钱：告诉警察或权威人士有人做错了事 If he finds out who dropped the dime on him, they're in trouble. 如果他发现是谁给了他一分钱，他们就有麻烦了。 I'm worried if I drop a dime on this guy, he'll get fired, which I don't think he really deserves. 我担心如果我在这个家伙身上花一毛钱，他会被解雇，我认为他真的不值得。