button one's lip

(informal)stop or refrain from talking

(非正式)不吭声，住嘴

press the button

(informal)initiate an action or train of events (often used to refer to the ease with which a nuclear war might be started)

(非正式)发动（事件）（常用来形容发动核战争多么容易）

push (或 press) someone's buttons

(informal)arouse or provoke a reaction of someone

(非正式)引起反应

don't allow co-workers to push your buttons.

别让你的同事牵着你的鼻子走。

button something up

(informal)complete or conclude something satisfactorily

(非正式)圆满结束

trying to button up a deal.

试图做成一笔交易。

[often as adj. buttoned]repress or contain something

压制（或控制）的

it was repressive enough to keep public opinion buttoned up.

弹压民意真是太专制了。

on the button

Exactly; precisely.

准确；确切