deconvert

An apostate.

To undergo a deconversion from a religion, faith or belief or (transitive) to induce (someone) to reject a particular religion, faith, or belief.

She has deconverted from Christianity, Islam, Judaism, etc.

They tried to deconvert him.

To revert or (transitive) to restore.

We must arrange to deconvert chartered vessels if the owner so desires. He may want them put back in the same condition as when chartered.

Most compression utilities...can convert and deconvert binhex files.

To change a building that has been converted to a new use back to its original use; specifically to change a house that has been converted into apartments or flats back to a single-family dwelling.

1963, William E Glynn, Leadership Roles read in Paul Vernon Betters (editor), City Problems: The Annual Proceedings of the United States Conference of Mayors, City Problems: The Annual Proceedings of the United States Conference of Mayors, p. 86, Roofs were repaired, houses were painted, and rooming houses converted back to single family residences. And meanwhile the owners have spent about $60000 to deconvert the building to its legal use...Orders to deconvert buildings which had been cut up into smaller apartments totaled 156 last year compared with 77 in 1961.

The most effective injunction issued was to compel owners to deconvert buildings illegally converted to their original architectural structure.