(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
button something up
(informal)complete or conclude something satisfactorily(非正式)圆满结束[often as adj. buttoned]repress or contain something压制（或控制）的
on the button
Exactly; precisely.准确；确切
柯林斯高阶英汉双解学习词典释义
N-COUNT
纽扣；扣子
Buttons are small hard objects sewn on to shirts, coats, or other pieces of clothing. You fasten the clothing by pushing the buttons through holes called buttonholes.
A button is a small piece of metal or plastic which you wear in order to show that you support a particular movement, organization, or person. You fasten a button to your clothes with a pin.
PHRASE
（巧妙地）获取想要的东西
If you say that someone presses the right button or pushes the right button, you mean that they get what they want from a particular situation or person by behaving in a clever way.