bat of the eye

I want the facts—every word the girl said, every look, every bat of the eye, every sneer.

I come over here to this tournament with you, at your invite, and if he shows by a single bat of the eye that he thinks I meant anything else he'll hear something that will ring in his ears till he's put under ground.

The automaton of the body responds as quickly to the bat of the eye as it does to the movement of the whole body.