not worth a rap
(v.)毫無價值
Rap, n. A popular name for any of the tokens that passed current for a half-penny in Ireland in the early part of the eighteenth century; any coin of trifling value.
Many counterfeits passed about under the name of raps. --Swift.
Tie it [her money] up so tight that you can't touch a rap, save with her consent. --Mrs. Alexander.
Not to care a rap, to care nothing.
Not worth a rap, worth nothing.
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