dimeyoudaoicibaDictYouDict[dime 词源字典]
dime: [14] Dime originally meant ‘tenth part’, and often specifically a ‘tax of one tenth, tithe’: ‘From all times it was ordained to pay dimes or tithes unto the Lord’, James Howell, Lexicon tetraglotton 1660. It came via Old French disme from Latin decima ‘tenth part’, a derivative of decem ‘ten’ (to which English ten is related). The application of the word to a coin worth one tenth of a US dollar dates from the 1780s.
=> decimal, ten[dime etymology, dime origin, 英语词源]
dime (n.)youdaoicibaDictYouDict
chosen 1786 as name for U.S. 10 cent coin, from dime "a tenth, tithe" (late 14c.), from Old French disme (Modern French dîme) "a tenth part," from Latin decima (pars) "tenth (part)," from decem "ten" (see ten).

The verb meaning "to inform" (on someone) is 1960s, from the then-cost of a pay phone call. A dime a dozen "almost worthless" first recorded 1930. Phrase stop on a dime attested by 1954 (a dime being the physically smallest unit of U.S. currency).