Definition of: disconcert

(dis′kən·sûrt′) v.t.
1. To disturb the self-possession or composure of; confuse; upset.
2. To throw into confusion; frustrate, as a plan. See synonyms under ABASH. [<MF disconcerter <dis- apart + concerter agree]
—dis′con·cert′ing adjective
—dis′con·cert′ing·ly adverb
—dis′con·cer′tion, dis′con·cert′ment noun