harm a hair on (one's) head

(redirected from harm a hair on their heads)

harm a hair on (one's) head

To hurt or injure one in any way. This phrase is often used in the negative. If I find that he harmed a hair on your head, I'll go to his house right now! He wouldn't dare harm a hair on your head—not when I'm around.
See also: hair, harm, head, on