What is "demerge"

Demerge \De*merge"\, v. t. [L. demergere.] To plunge down into; to sink; to immerse. [Obs.]

The water in which it was demerged.
--Boyle.

Etymology 1 vb. (context business English) To separate companies that were formerly combined; to reverse a merger. Etymology 2

vb. (context obsolete English) To plunge down into; to sink; to immerse.