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.

VERB 扣上…的纽扣 If you button a shirt, coat, or other piece of clothing, you fasten it by pushing its buttons through the buttonholes.

N-COUNT （机器的）按钮，开关 A button is a small object on a machine or electrical device that you press in order to operate it.

N-COUNT 圆形小徽章 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.