: a small, usually round piece of plastic, glass, metal, etc., that is sewn to a piece of clothing and is pushed through a loop or hole to fasten one part of the clothing to another part
: a small, usually round sign that has a picture or words on the front and a pin on the back
: a small part of a machine that you push to make the machine work
: to attach (a button) by passing it through a hole
: to close or fasten (something) with buttons
: to have buttons for fastening
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