hand over head

back of one's hand

A display of disrespect or scorn.

bang one's head against a brick wall

To waste effort on a futile project.

bash someone's head

To beat up someone violently.

bear a hand

To make haste; to help quickly.

big hand

Synonym of minute hand (on a clock face).

big head

An inflated ego, an exaggerated belief in one's own importance.

bite someone's hand off

To enthusiastically accept an offer.

bite someone's head off

To severely berate someone.