double tap
1. noun The firing of a semi-automatic gun twice in rapid succession into the same target zone, especially the head of a victim. The assassin's signature kill was a single shot to the chest and a double tap to the head of his targets.
2. noun The act of touching or pressing lightly with the fingers twice in rapid succession, as on a touch-sensitive screen or device. Just give the application's icon a quick double tap for it to open.
3. verb To fire a semi-automatic gun twice in rapid succession into the same target zone, especially the head of a victim. Always be sure to double tap your target to ensure they will not be getting up again.
4. verb To tap a touch-sensitive screen or device twice in rapid succession. You just have to double tap the icon on the screen for the application to open.