The word "sub-merge" refers to sinking under water or disappearing from view. Some antonyms for this word are "emerge," "rise," and "surface." These words indicate coming up from beneath in a vertical motion, rather than sinking down. Other possible antonyms for "sub-merge" could include "appear," "materialize," "come to light," or "resurface." These words connote a return to visibility or existence, as opposed to the act of disappearing. By understanding and utilizing antonyms for "sub-merge," speakers and writers can more accurately convey their intended meaning and create a clearer sense of contrast and distinction within their language.