(尤指对孩子)打一巴掌

I gave the child a potch for being so rude.

我给了那孩子一巴掌，因为他太粗鲁无礼了。

用手掌打(孩子的屁股)

She took down the child's pants and potched his bottom.

她拉下孩子的裤子，接着就用手掌揍他的屁股。

碰击,撞击

The waves are constantly potching against the bank of the river.

波浪不断地拍打着河岸。