巴掌 (bā zhang): palm of the hand; classifier: slap

When I was little and disobedient, my grandma was so angry that she gave me a slap.

He has a red slap mark on his face; he must have been hit by someone.

This child's face is only as big as a palm; it's really adorable.

He slapped the table with his hand, and as a result his palm turned red from the slapping.

A mosquito bit my hand, and I instinctively gave it a slap and killed it.

When the two were arguing, she acted on impulse and gave him a loud slap.