If you dare lay a finger on him...

lay a finger on sb. 中文所对应的意思“动某人一根手指头/动某人一根汗毛”

e.g. If you lay a finger on her, you’ll live to regret it!

lay的其他特殊的用法

1. （鸟）产（卵），下（蛋）

When a female bird lays an egg, it produces an egg by pushing it out of its body.

2. 布置餐桌，摆放餐具 set/lay the table

(To place and arrange things to be used while eating a meal, such as plates, utensils(器皿), glasses, napkins, etc..)