(1) It did not appear that such an inquiry had been tactful of her, the waitress noticed, nervously biting her underlip .

(2) She stopped working for a moment and stared at her, biting her underlip , twisting her mouth.

(3) He is pimply, his neck is thin, his blue eyes goggle, and his underlip extrudes.

(4) Miguel would bite down on one side of his underlip , and slowly release it.

(5) If the urgency of time wasn't dire enough, Cao bit his underlip , realizing had just earned himself a new enemy - politics.