sentry

nounmasculine/feminine/sẽ.tiˈnɛ.lɐ/medium

sen·ti·ne·la

Definition

A soldier or guard whose job is to stand and keep watch.

The sentry challenged anyone approaching the gate.

They posted a sentry outside the commander's tent.

syn

Do italiano 'sentinella', possivelmente de 'sentina' (sentina, por analogia de vigilância).