Meaning of the word sentinel in English

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

sentinel

US /ˈsen.t̬ɪ.nəl/
UK /ˈsen.tɪ.nəl/

Noun

a soldier or guard whose job is to stand and keep watch

Example:
The lone sentinel stood guard at the castle gate.
The ancient tree stood as a silent sentinel over the valley.

Verb

to guard or protect (something)

Example:
The soldiers were ordered to sentinel the perimeter.
A lighthouse sentinels the treacherous coastline.