lay a finger on

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.
Categories: bother conditional interrogative verb