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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