dime
noun /daɪm/
  /daɪm/
 Idioms - a coin of the US and Canada worth ten cents(美国、加拿大的)十分硬币,十分钱 词源late Middle English: from Old French disme, from Latin decima pars ‘tenth part’. The 词源ally 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。 
 
- If he finds out who dropped the dime on him, they're in trouble.