Military supervision or observation from a superior position.

Video game where players protect objectives and teammates.

Close surveillance, especially for security or protection purposes.

Supervise or monitor from a higher vantage point.

Provide cover and protection for teammates in combat.

Keep watch over an area to prevent danger.

Overwatch (video game): Team-based shooter developed by Blizzard Entertainment.

Operation OverWatch: Military operation to provide cover and surveillance.

Watch over something protectively; keep an eye on.