scare (one) stiff(redirected from scares them stiff)
scare (one) stiff
To shock or frighten someone very suddenly and/or severely. Don't sneak up on me like that, you scared me stiff! That car accident seems to have scared Janet stiff—she's still shaken by it.
scare someone stiff
Fig. to frighten someone severely. (Stiff = dead.) That loud noise scared me stiff. The robber jumped out and scared us stiff.