There is a common, usually round object that you can see every day and it appears in many expressions—buttons! Buttons, which are made of metal or plastic, are found on all sorts of clothing. They fasten or connect one piece of clothing to another to make sure your clothes don't fall off.
To be cute as a button is an old saying, which means to be attractive or sweet, but in a small way. Babies are often described as cute as a button. Language experts don't know why. But they do say the expression dates from the late 1860s.
Here is another expression associated with button: button－down. People often wear button－down shirts to the office. Button－down as an adjective means to be conservative. People described as button－down stay as close as possible to the normal way of dressing and behaving.
When buttoning a button, you slip it into a buttonhole. A buttonhole traps the button. So, to buttonhole someone means you have trapped him in a spoken conversation.Now, let's say you find yourself buttonholed in a conversation at a party. Someone just keeps talking and talking and talking! Finally, you can't stand it any longer. You tell him to button it! This is a direct, but a little rude way of saying “Stop talking！” Button your lip is another equally rude way to stop a person who talks too much.
Another kind of difficult person is someone who pushes__one's__buttons. To push one's buttons means to know how