What does “lay a finger on” mean?

to touch sb with the intention of hurting them physically

How is “lay a finger on” used?

In What's Eating Gilbert Grape (1993), one line is: “or even just lays a finger on you, what are you gonna do?”

The clip at the top of this page is from What's Eating Gilbert Grape (1993).

or even just lays a finger on you, what are you gonna do?

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