patrol

From WikiWord, the free dictionary

/pəˈtɹəʊl/ English

Definitions

A going of the rounds along the chain of sentinels and between the posts, by a guard, usually consisting of three or four men, to insure greater security from attacks on the outposts.
A movement, by a small body of troops beyond the line of outposts, to explore the country and gain intelligence of the enemy's whereabouts.
The guards who go the rounds for observation; a detachment whose duty it is to patrol.
Any perambulation of a particular line or district to guard it; also, the people thus guarding.“a customs patrol”

To go the rounds along a chain of sentinels; to traverse a police district or beat.
To go the rounds of, as a sentry, guard, or policeman“to patrol a beat”