button

A button is a round object that can be pushed through clothing so that the clothing stays on.

Example: Sarah's sweater doesn't work anymore because the buttons popped off.

A button is a switch that is turned on by pressing it.

Example: I pressed the button to turn on the television.

A button is a badge that can be worn of clothing and is put onto the clothing with a pin to hold it in place.

Example: I have a "Vote for Bush" button.

If a poker player has the button, he is the last person to act on that hand.

If you button something, you fasten it with a button.

Example: Button up your coat!