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je ne sais quoi

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je ne sais quoi/ʒənəˌseɪˈkwɑː/noun
je ne sais quoi
/ʒənəˌseɪˈkwɑː/
noun
Learner's definition of JE NE SAIS QUOI  
[singular]sometimes humorous
: a pleasant quality that is hard to describe
◊ In French the phrase je ne sais quoi means literally “I know not what.”
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