"Clapping a hand on" is a phrase often used to describe a physical gesture of approval or acknowledgement. However, there are several antonyms for this phrase that could convey the opposite meaning. Instead of clapping a hand on someone's shoulder, one could ignore them completely, turn their back, or even give them a disapproving glare. These actions convey a lack of approval, acknowledgement, or warmth towards the other person. It's important to remember that body language and gestures can have a significant impact on how we are perceived by others, and choosing the right antonym for "clapping a hand on" can be crucial in conveying the appropriate message.