To retrace one's steps.
To exercise a racehorse around the racetrack in the opposite direction to that in which races are run.
To taxi down an active runway in the opposite direction to that being used for takeoff.
To repeat or review work already done.
the act of backtracking
To administer the sacrament of confirmation on (someone).
To assure the accuracy of previous statements.
To strengthen; to make firm or resolute.