Sentinel - Definition, Meaning & Synonyms | Vocabulary.com
https://www.vocabulary.com/dictionary/sentinel
WebA sentinel is a guard, a lookout, a person keeping watch. It's often a soldier, but not always. If you're watching a pot, waiting for it to boil, you're standing sentinel over it — and incidentally, it won't boil until you leave.
DA: 88 PA: 7 MOZ Rank: 69