A watchman, guard, keeper, warden.

A watchman.

A gatekeeper, porter, sentinel. Now rare.

A sentinel; also, the body of soldiers constituting the guard of a camp, town, gate of a town, etc. ? Obsolete exc. Historical.

A member of a military guard, a sentinel or sentry; a look-out posted to give warning of the approach of danger, etc. Obsolete in technical use.

Originally and chiefly Scottish. An outlying guard; a lookout.

A soldier or other person set to guard an entrance; also, a watchman on a tower.

= sentry, n.1 2. to stand sentinel (rarely passive to be set sentinel). †forlorn sentinel, = †sentinel perdu, perdu sentinel: see perdu, adj. 1.

Any person who acts as a lookout, scout, or spy. Also figurative. Obsolete.

transferred and figurative. One who or something which keeps guard like a military sentry.

Originally Nautical. A person stationed to keep watch, esp. for danger or trouble, or (less commonly) sent out to reconnoitre. Also occasionally: a…

(a) a person who puts up property as security or stands surety for someone (now rare); †(b) a person who seeks ‘securities’ or guarantees, esp…

= guardsman, n. 1 2.

A watchman, sentinel.

Australian slang. A lookout, esp. one posted by those engaged in an illegal activity. Cf. cockatoo, v. 3.

A man who acts as a guard; a member of a guard. Also figurative, a guardian (rare).

Denoting a person or thing (with varying degrees of contempt or admiration). School slang. A lookout; short for watchdog, n. Now rare.