Verb
scare someone out of their wits (third-person singular simple present scares someone out of their wits, present participle scaring someone out of their wits, simple past and past participle scared someone out of their wits)
(transitive, informal) To frighten someone to such an extent that they behave irrationally.
He scared me out of my wits, sneaking up behind me in the dark like that.
Synonym: frighten someone out of their wits