frighten the pants off (of) (one)(redirected from frightens the pants off of them)
frighten the pants off (of) (one)
To shock or frighten one very suddenly or severely. Don't sneak up on me like that—you frightened the pants off of me! The sound of the fire alarm at three in the morning frightened the pants off of me.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.