摘要：If you lay a finger on her, I'll beat your brains out!

lay a finger on

对……动（碰）一根毫毛（寒毛、汗毛）；触碰；冒犯

If you say that someone did not lay a finger on a particular person or thing, you are emphasizing that they did not touch or harm them at all.

一般用在否定句中，表示对某人秋毫无犯的意思。

I must make it clear I never laid a finger on her.

我得说清楚，我可没有动过她一根毫毛。

I never laid a finger on her.

我从来没有碰过她。

He didn't lay a finger on you.

他没有对你动过一个指头。

You shall not lay a finger on my daughter.

不许你动我女儿一根毫毛。

I never so much as laid a finger on them.

那些东西我连碰也没有碰过。

If you lay a finger on my son you'll regret it!

如果你敢动我的儿子一根毫毛，你会后悔的！

If you lay a finger on her, I'll beat your brains out!

你若动她一根汗毛, 我就打碎你的脑袋!

I'll kill you if you seas lay a finger on my sister again.

你再敢碰我妹妹一指头,我就杀了你。

He is only a child, if you lay a finger on him, you'll regret it!

他只是个小孩子，如果你敢动他一根毫毛，你会后悔的！

来源：翅膀英语一点号