To disconcert, put out. Cf. blench, v.1 5.

To put out of countenance; to nonplus, disconcert, ‘shut up.’ Cf. blank, adj. 5. archaic.

transitive. To cause to lose one's self-possession; to disconcert, discompose; to confuse; to embarrass.

To force out of a settled condition; to deprive of fixity or quiet. beliefs, thoughts, the mind, etc.

transitive. To disturb the composure of (a person); to confuse, unsettle, fluster. Also occasionally intransitive.

transitive. To cause to lose concentration; to disconcert, confuse, ‘throw’. Also: to cause to be mistaken, to mislead.

Rowing. to put (someone) off (his) stroke, to distract (someone) from his course of activity; to disconcert or disturb. colloquial.

transitive. North American slang. to bend (a person) out of shape. To annoy, upset; to disconcert. Usually in passive.

transitive. colloquial. To disconcert or confuse (someone); to disturb, upset. Cf. main sense 38, to throw out 8b at phrasal verbs, to put off 7d at…