unmigrate

Verb

unmigrate (third-person singular simple present unmigrates, present participle unmigrating, simple past and past participle unmigrated)

1. (rare) To reverse the process of migration; to switch back to an older system.
   • I could “unmigrate” the tapes, and that would take a while, but it wasn't that much of a nuisance and it helped keep the mainframe's disks free.2011, Mark Minasi, Rhonda Layfield, John Paul Mueller, Mastering Windows Server 2008 Networking Foundations, page 6-168
2. To work backwards from the point where an observation was made to deduce the location from which it migrated.
   • If the line is to be perpendicular to the strike, we can unmigrate the seismic data, as shown in Fig. 21.6, and we then know how far we have to run the seismic line to tie the well data at any given depth.1979, Robert E. Sheriff, First Course in Geophysical Exploration and Interpretation, page 259