to turn the corners of the mouth downward or stretch the lower lip outward to express contempt, dissatisfaction, or a desire to cry

(bound form) tooth; teeth; refers specifically to the organs in the mouth used for chewing, as in 牙齿 yá​chǐ

to stretch; to prolong; to drag out or lengthen a sound or distance

mouth of a person or animal; beak, bill, or snout