Sentry /(?)/

Sen·try

Sentry

n.

pl. Sentires

  1. A soldier placed on guard; a sentinel. (Mil.)
  2. Guard; watch, as by a sentinel.
    Here toils, and death, and death's half-brother, sleep, Forms terrible to view, their sentry keep.

Phrases & Compounds
Sentry box
a small house or box to cover a sentinel at his post, and shelter him from the weather.