back of (one's) hand(redirected from back of their hands)
back of (one's) hand
A display of rejection, disdain, or contempt (for a person or thing). She met their accusations with the back of her hand. I give the back of my hand to anyone who says I'm not a good parent.
back of one's hand
Rejection or contempt, as in Unimpressed with him, she gave the back of her hand to his suggestion. This phrase is usually the object of a verb such as give or show. [Second half of 1700s] Back of the hand similarly means "an insult" in the term back-handed compliment (see under left-handed compliment) but has a quite different meaning in know like the back of one's hand (see under know like a book).