1) Click open 2) One way to take off a coat 3) Open a fastening 4) Open or detach 5) Open up 6) Open with a click 7) Open with a pop 8) Open, like some jackets 9) Pop a fastening 10) Release with a click 11) Release with a pop 12) Remove tearaway pants 13) Remove the handcuffs 14) Take off a jacket 
to undo by or as if by opening snap fasteners: to unsnap a dress.