frighten (one) out of (one's) mind(redirected from frighten them out of their mind)
frighten (one) out of (one's) mind
To shock or scare one very suddenly and/or severely. Hyperbolically alludes to frightening one so severely as to cause them to become insane. Don't sneak up on me like that, you frightened me out of my mind! That car accident seems to have frightened Janet out of her mind—she's still shaken by it.