retrace

To trace (a line, etc. in drawing) again.

To go back over something, usually in an attempt at rediscovery.

He retraced his steps, and found his keys where he had dropped them.

Instead of retracing my route, I have elected to walk across Blackpool to the town's remaining large station, although even this has been greatly reduced in size.

To undergo retracement.

The period when the beam of the cathode-ray tube returns to its initial horizontal position in order to start the next line of the display.

An instance of retracement.