frighten (one) out of (one's) mind(redirected from frightens them out of their minds)
frighten (one) out of (one's) mind
To shock or scare one very suddenly 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 really frightened Janet out of her mind. She's still shaken by it.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.