cut the mustard
Perform satisfactorily, as in We need a better catcher; this one just doesn't cut the mustard. The origin of this expression is disputed. Some believe it alludes to mustard in the sense of the best or main attraction (owing to its spicing up food), whereas others believe it is a corruption of pass muster. Still others hold that it concerns the preparation of mustard, which involves adding vinegar to mustard seed to "cut" (reduce) its bitterness. The expression is often in negative form, as in the example. [Slang; c. 1900]
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