Collocations for button - noun

bottom, top
The top button of his shirt was undone.

coat, shirt, etc.

do up, fasten | undo, unfasten | fumble with | lose
My coat has lost a button.

rip off | sew on

be missing, come off, pop (off)
There was a button missing from his shirt.

on, start/starter | off, stop | control | fast forward, pause, play, rewind | alarm, panic
She hit the alarm button as fast as she could.

mouse | self-destruct
(often figurative)

click (on)
(computing),

depress, hit, hold down, press, push
Click the left mouse button twice.

keep your finger on | release, take your finger off

at the touch of a button
The remote control allows you to change channel at the touch of a button.