Meaning of the word sentry in English

What does sentry mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

sentry

US /ˈsen.tri/
UK /ˈsen.tri/

Noun

a soldier stationed to keep guard or to control access to a place

Example:
The sentry stood motionless at the gate.
A lone sentry guarded the entrance to the fortress.