bite one's lip

repress an emotion; stifle laughter or a retort

咬緊嘴唇；壓抑感情；抑制笑容；忍住不說

she bit her lip to stop the rush of bitter words.

她咬緊嘴唇，強忍住沒沖口說出尖刻的話。

curl one's lip

raise a corner of one's upper lip to show contempt; sneer

（表示輕蔑的）撇嘴

lick (或 smack) one's lips

look forward to something with relish; show one's satisfaction

舐嘴唇（表示滿意和渴望）

my (或 his 等) lips are sealed

pass one's lips

be eaten, drunk, or spoken

吃進去；喝下去；說出口

pay lip service to

express approval of or support for (something) without taking any significant action

口惠而實不至