Definition of je ne sais quoi

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je ne sais quoi    (zh n s kwä, s) KEY 

NOUN:

A quality or attribute that is difficult to describe or express: "Fishing has lacked a certain je ne sais quoi in terms of its public image, as all activities must that involve beer, worms and one-size-fits-all gimme caps" (Charles Leerhsen).

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ETYMOLOGY:
French : je, I + ne, not + sais, first person present indicative of savoir, to know + quoi, what