backtrack

Short definition from Wiktionary

Noun

1. 1
   the act of backtracking

Verb

1. 1
   To retrace one's steps.
2. 2
   To repeat or review work already done.
3. 3
   To taxi down an active runway in the opposite direction to that being used for takeoff.
4. 4
   To exercise a racehorse around the racetrack in the opposite direction to that in which races are run.
5. 5
   To go back on or withdraw a statement.