扣动

扣动	kòu dòng	to pull (a trigger)
扣	kòu	to fasten / to button / button / buckle / knot / to arrest / to confiscate / to deduct (money) / discount / to knock / to smash, spike or dunk (a ball) / to cover (with a bowl etc) / (fig.) to tag a label on sb / (Tw) (loanword) code
扣	kòu	button
动	dòng	(of sth) to move / to set in movement / to displace / to touch / to make use of / to stir (emotions) / to alter / abbr. for 动词, verb