英和和英

push the button down

press a button

undo the buttons of

to press a button

to press the button

to sew on a button

to sew a button on

fasten buttons

provide with buttons

to fasten one's coat with buttons―button one's coat

to fasten a coat with buttons―button up a coat

to undo a button―（上衣のボタンなら）―unbutton one's coat

to undo a button―unbutton one's coat

to finger a button―fumble a button

at the pressing of a button

push the shutter

to make a thumb-print （on a document）―seal a document with a thumb-print

Click the button

to attach a stamp

sew the button down

fasten with buttons

press down

squeeze the trigger

sew a button on

A button comes off.

to sew on a button

pull the trigger

pull the trigger

pop the clutch

A button has come off