simple as kiss your hand

back of one's hand

A display of disrespect or scorn.

bear a hand

To make haste; to help quickly.

betray with a kiss

To betray someone in a seemingly inconspicuous or innocuous manner.

big hand

Synonym of minute hand (on a clock face).

bite someone's hand off

To enthusiastically accept an offer.

bite the hand that feeds one

To cause harm to a benefactor (especially one that one is dependent on, thus with the idea that this behaviour is self-damaging).

blow a kiss

To kiss one's own hand, then blow on it in a direction towards the recipient.

cap in hand

In a humble and respectful manner.