To Abash

1. (transitive) To make ashamed; to embarrass; to destroy the self-possession of, as by exciting suddenly a consciousness of guilt, mistake, or inferiority; to disconcert; to discomfit. [First attested from around (1150 to 1350).][1]

Synonyms: bewilder, confuse, confound, daunt, discompose, disconcert, discountenance, dishearten, embarrass, faze, fluster, humble, humiliate, mortify, rattle, shake, shame, snub

Antonyms: abet, animate, buoy, cheer, countenance, embolden, encourage, incite, inspirit, rally, reassure, uphold

2. (intransitive, obsolete) To lose self-possession; to become ashamed. [Attested from around (1350 to 1470) until the late 16th century.][1]

Of abash, confuse, confound: Abash is a stronger word than confuse, but not so strong as confound.