chin jerk
chin reflex

Garrick's chin jerked up and his breathing jammed and then started again.

Namri's chin jerked down and he stared sharply at Leto.

Marsali's chin jerked contemptuously in my direction.

His chin jerked in the direction of the neckline of her saque.

Mary's chin jerked briefly in the direction of the odd assortment of chairs.

His chin jerked up and down several times as he came to a halt before her desk.

Her chin jerked to the side.

He stopped, dazed, and then his face lit up, his shoulders straightened and his chin jerked forward.

His chin jerked towards a thin, plain girl huddled against the rock wall.

His chin jerked over his shoulder, indicating some spot far back in the march.