Pa·trol v. i. [imp. & p. p. Patrolled p. pr. & vb. n. Patrolling.]  To go the rounds along a chain of sentinels; to traverse a police district or beat.
  patrol
       n 1: a detachment used for security or reconnaissance
       2: the activity of going around or through an area at regular
          intervals for security purposes
       3: a group that goes through a region at regular intervals for
          the purpose of security
       v : maintain the security of by carrying out a control [syn: police]
       [also: patrolling, patrolled]