Английский словарь американских идиом - lay a finger on

{v. phr.} To touch or bother, even a little. - Used in negative, interrogative, and conditional sentences. * /Don't you dare lay a finger on the vase!/ * /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./ Compare: LAY HANDS ON, PUT ONE'S FINGER ON.