frighten the life out of (one)
To shock or frighten one very suddenly and/or severely. (Hyperbolically alludes to frightening someone so severely as to cause them to die.) Don't sneak up on me like that, you frightened the life out of me! That car accident seems to have frightened the life out of Janet—she's still shaken by it.
frighten the life out of someone
or scare the life out of someone
INFORMALIf someone or something frightens the life out of you or scares the life out of you, they frighten you very much. It used to frighten the life out of me when they tried to jump on the moving trains. Further tests revealed that I needed major heart surgery. It scared the life out of me.
frighten the life out of
terrify.frighten/scare the ˈlife out of somebody
frighten somebody very much: Don’t do that! You scared the life out of me creeping up on me like that!