double tap

Short definition from Wiktionary

Noun

1. 1
   A tactical shooting technique of pulling the trigger of a weapon twice in quick succession to deliver two shots to the same target zone.
2. 2
   Two shots or bullets fired in such a way.
3. 3
   A bombing strategy where the same target is attacked twice, with the second attack targeting rescuers and mourners.

Verb

1. 1
   To shoot twice in rapid succession.
2. 2
   To click twice on a touchscreen.
3. 3
   Alternative form of double tap (“to shoot twice”).
4. 4
   Alternative form of double tap (“to click twice on a touchscreen”).