He gave the child a slap on the back.

他在孩子的背上打了一巴掌。

youdao

I was nearly knocked down by a slap on the back.

我被背后突然的一击差点打倒。

youdao

We got a slap on the back for staying late at work.

我们因工作到很晚而受到了表扬。

youdao

Mrs Albright gave her embattled ally a figurative slap on the back, praising Japan for its loyalty and bravery.

ECONOMIST: The ungrateful Japanese

In forums that look like Twitter feeds or Facebook pages, sales teams can share leads and information about clients (some of it gleaned from profiles on public networks), ask for and get speedy approval of discounts and slap one another virtually on the back for clinching a deal.

ECONOMIST: Microsoft in pursuit (1)