pound salt

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pound salt

To engage in pointless, menial efforts or labor. Used as an imperative to express disdain, contempt, or dismissal. A variant of the more common expression "pound sand." I can't believe Sam told his teacher to go pound salt. Where does that kid get such attitude? Charles, why don't you pound salt instead of coming around here hassling me about my business?
See also: pound, salt
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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I understand that, but talk about pounding salt in the wound.