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 If he finds out who dropped the dime on him, they're in trouble. 如果他发现谁把一角钱扔在他身上，那就麻烦了。 I'm worried if I drop a dime on this guy, he'll get fired, which I don't think he really deserves. 我担心如果我给这家伙放一角钱，他会被开除，我认为他不配得到。