Close observation or careful monitoring of something or someone, or the title of a popular team-based video game.
Compound of 'over' (above, supervising) + 'watch' (to observe). The word has been used in English since the 1500s to mean careful surveillance or supervision.
The Overwatch video game cleverly used this word because it's about a team of heroes watching over the world—and in gameplay, 'having overwatch' means controlling a position to monitor enemies!
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