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disconcert (v.)

"throw into confusion," 1680s, from French disconcerter (Modern French déconcerter) "confused," from dis- "do the opposite of" (see dis-) + concerter (see concert (v.)). Related: Disconcerted; disconcerting; disconcertingly.

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Definitions of disconcert from WordNet

disconcert (v.)
cause to feel embarrassment;
Synonyms: confuse / flurry / put off
disconcert (v.)
cause to lose one's composure;
Synonyms: upset / discompose / untune / discomfit
From wordnet.princeton.edu