with obj.
slap with one's open hand or a flat object, especially on the buttocks as a punishment
用手掌或扁平物掴; 拍打（尤指打屁股作为惩罚）：
she was spanked for spilling ink on the carpet.
她因为把墨水撒在地毯上被打屁股了。
a slap of this type
拍打; 一掴, 一巴掌; 打一记屁股。
词源
early 18th cent.: perhaps imitative.