lay a finger on

lay a finger on  {v. phr.}

(Пальцем) трогать; беспокоить. — Используется в отриц., вопр. или усл. предл.

Don't you dare lay a finger on the vase! — Не вздумай вазу даже пальцем трогать!

Suppose Billy fakes his brother with him; wilt the mean, tough boy down the street dare lay a finger on him?

If you so much as lay a finger on my boy, I'll call the police.

Ср.: LAY HANDS ON, PUT ONE'S FINGER ON.