He was so surprised at my unexpected behavior that his chin dropped.

After a moment, Mike's chin dropped to his chest.

Then his chin dropped, and he appeared to drift off.

For once, her chin dropped rather than thrusting upward into his face.

Cone's chin dropped to his chest, and he stared at the ground.

Rodney's chin dropped to his chest before he looked at Lexie again.

Miller's chin had dropped onto the lap of his overcoat.

She looked at him, her chin dropped, her eyebrows raised.

He looked more as if his chin had simply dropped away from the rest of his face.

His chin dropped to his chest, and he started crying.