n. An erroneous entry or charge, as of an account. [ 1913 Webster ]
n. (Mil.) A sentry who guards the entrance or approach to a place; an outguard. [ 1913 Webster ]
n.;
Here toils, and death, and death's half-brother, sleep,
Forms terrible to view, their sentry keep. Dryden. [ 1913 Webster ]
Sentry box,