button
nounUK /ˈbʌt.ən/
US /ˈbʌt.ən/
A button is a small round thing you press to make something work.
Press the button to start the toy car.
OTHER MEANINGS
2. A small round object used to fasten clothes.
He lost a button from his shirt.
3. A small badge worn on clothing to show support or identity.
She wore a button with her favorite band's logo.
4. A small part on a machine or device that you push.
The elevator button was stuck.