abash

Etymology

Attested from 1303, as Middle English abaisen, abaishen, abashen (“lose one's composure, be upset”), from the later 14th-century also transitive "to make ashamed, to perplex or embarass"; from Anglo-Norman abaïss, from Middle French abair, abaisser (“lose one's composure, be startled, be stunned”), from Old French esbaïr, (French ébahir), from es- (“utterly”) + baïr (“to astonish”), from Medieval Latin *exbadō, from ex- (“out of”) + bado (“I gape, yawn”), an onomatopoeic word imitating a yawn, see also French badaud (“rubbernecker”).

verb

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.
   The stare seemed to abash Poirot. 1934, Agatha Christie, chapter 8, in Murder on the Orient Express, London: HarperCollins, published 2017, page 129
2. (intransitive, obsolete) To lose self-possession; to become ashamed.
   … as King Uther lay by his queen, he asked her, by the faith she owed to him, whose was the body; then she sore abashed to give answer. 31 July 1485, Sir Thomas Malory, chapter III, in William Caxton, editor, Le Morte d'Arthur, volume 1