intransitive verb. To go back over the course by which one has come.

intransitive verb. To return to a previous point or subject, as in a lecture or discussion.

intransitive verb. To reverse one's position or policy.

noun. the act of backtracking

verb. to retrace one's steps

verb. to repeat or review work already done

verb. To taxi down an active runway in the opposite direction to that being used for takeoff

verb. retrace one's course

"It may also lead to a situation in which it is not always possible to backtrack from a citation to a source, because somewhere along the way somebody decided a certain, necessary piece of information was unnecessary."

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backtracked  backtracking  backtracks