A walking or marching round, as in a camp, garrison, town, or other place, in order to watch and protect it, 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, Any perambulation of a particular line or district to guard it; also, the men thus guarding; as, a customs patrol; a fire patrol, verb_ maintain the security of by carrying out a patrol, intransitive verb_ To engage in a patrol of, To go the rounds along a chain of sentinels; to traverse a police district or beat, transitive verb_ To go the rounds of, as a sentry, guard, or policeman