frighten one out of wits
frighten (one) out of (one's) wits
To shock or scare someone very suddenly and/or severely. (Hyperbolically alludes to frightening someone so severely as to cause them to lose their mind.) Don't sneak up on me like that, you frightened me out of my wits! That car accident seems to have frightened Janet out of her wits—she's still shaken by it.
frighten one out of one's witsand scare one out of one's wits; frighten someone out of a year's growth; scare someone out of a year's growth; frighten one out of one's mind; scare one out of one's mind
Fig. to frighten one very badly. Oh! That loud noise scared me out of my wits. I'll give him a good scolding and frighten him out of his wits. Oh, you frightened me out of a year's growth! You frightened Bob out of his mind.