underlip
/ˈʌndəlɪp
/noun
The lower lip of a person or animal.He is pimply, his neck is thin, his blue eyes goggle, and his underlip extrudes....
- She stopped working for a moment and stared at her, biting her underlip, twisting her mouth.
- If the urgency of time wasn't dire enough, Cao bit his underlip, realizing had just earned himself a new enemy - politics.