Muster Funeral Home Obituaries. muster out, to discharge from service in the armed forces: He wi

muster out, to discharge from service in the armed forces: He will be mustered out of the army in only two more months. To call together, as for inspection. mus·tered , mus·ter·ing , mus·ters v. How to use muster in a sentence. MUSTER meaning: 1 : to work hard to find or get (courage, support, etc. 1. To cause to come together; gather: Bring all the volunteers you can There are 14 meanings listed in OED's entry for the noun muster, five of which are labelled obsolete. Synonym Discussion of Muster. Learn more. See examples of muster used in a sentence.