noun, noun or participle which takes 'suru'
A strike with the open palm. Can refer to a slap to the face, a smack on the body, or spanking. Often used in the phrase 平手打ちを食らわす (to slap someone).
彼は怒って相手に平手打ちを食らわせた。
He got angry and slapped his opponent.
子供のいたずらに平手打ちで罰を与える親もいる。
Some parents punish their children's mischief with a spanking.