To drop a dime on someone is to make a telephone call to inform the police on them or to betray them.
This phrase can be traced back to pay phones in the US. In the 1960’s and 1970’s it cost ten cents or a dime to make a station to station call from a pay phone in the US. To use a pay phone during those years you literally dropped a dime in to the dime slot on the pay phone and thus the phrase “Drop A Dime” was born out of that experience.
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