abash
Abash (verb) means to make someone feel embarrassed or ashamed, so that they lose their composure.
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 embarrass"; 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 (“to gape, yawn”), an onomatopoeic word imitating a yawn, see also French badaud (“rubbernecker”).