B1 a small, usually circular object used to fasten something, for example a shirt or coat纽扣,扣子
More examples
The machine emits a high-pitched sound when you press the button.
Press this button and the video will automatically tune itself to the next channel.
To turn the television on, you just push this button.
He toyed nervously with a button on his jacket as he was speaking.
I put my money in the slot and pressed the button but nothing came out.
to fasten something, usually a piece of clothing, using buttons扣上(…的)纽扣
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