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 —called also (British) badge
a small part of a machine that you push to make the machine work
2buttonverb
to attach (a button) by passing it through a hole
to close or fasten (something) with buttons —often + up
