1) Blizzard game 2) Comic set in Brazil 3) Esports game 4) First-person shooter 5) Multiplayer online game 6) PlayStation 4 game 7) Square Enix game 8) To watch over 9) To weary by keeping awake 10) Windows game 
In modern warfare, overwatch is the state of one small unit or military vehicle supporting another unit, while they are executing fire and movement tactics. An overwatching, or supporting unit has taken a position where it can observe the terrain ahead, especially likely enemy positions. This allows it to provide effective covering fire for advanc...
• (v. t.) To watch too much. • (v. t.) To weary or exhaust by watching.
O'ver·watch' transitive verb 1. To watch too much. 2. To weary or exhaust by watching. Dryden. 
to watch over. · to weary by keeping awake.