sentinel
BrE /ˈsenti.nəl/ AmE /ˈsɛn.tɪ.nl/
noun en → es
a soldier or guard who stands in a particular place to watch for danger and warn others of it
centinela, guardia
- sentinel at somewhere
Collocations sentinel on duty · sentinel post
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The sentinel stood guard outside the palace.
El centinela estaba de guardia fuera del palacio.
a person or thing that watches over and protects something
vigilante, protector
- sentinel of/over something
Collocations sentinel of the forest · sentinel over a city
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The statue serves as a sentinel over the town.
La estatua sirve como vigilante sobre la ciudad.