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 relinquish (something)
To admit defeat, capitulate
Become fully taken over by a certain quality, activity, trait, &c.
To abandon (someone or something)
To execute a trade on behalf of another broker.
To stop or quit (an activity, etc.)
To surrender (someone or something)
To lose hope concerning (someone or something)