noun
sentry
SEHN-tree
noun
1
A soldier or guard posted to watch over an entrance or area.
"Two sentries stood guard outside the barracks."
How to Use Sentry
Learner’s notesIn plain EnglishA guard, especially a soldier on watch duty.
Easily confused with
Common pairings
stand sentry
sentry duty
post a sentry
Word Forms
sentries plural
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Etymology
Origin uncertain; possibly an alteration of "sentinel."