Or some idiot might step on your hand.

The plaintiff sued for personal injuries after the defendant stepped on her hand during a touch football game.

In doing so, he stepped on the man's hand, bent down, and picked up his blaster.

Harvath stepped on his right hand and pulled the man's head up by his hair.

I want you to try," he said, "to step on my hand.

It was dark and someone had stepped on my hand.

I stepped on his hand, pinning it to the earth.

After a fall a horse had stepped directly on his hand.

Someone stepped on his hand and he yelled.

Katherina isn't expecting Petruchio to actually step on her hand but is simply making a symbolic gesture.