This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To watch over.

n. The supervision of one unit or vehicle by another while the supervised unit is firing or moving.

v. To watch too much.

v. To weary or exhaust by watching.

To watch to excess.

To exhaust or fatigue by long want of rest.

To watch over; overlook.

To watch too long or too late.

n. Watching too long or too late.

"By next fall the Marines plan to be in what they call an "overwatch" role."

watch    guard   

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