- muster (v.)
- c.1300, "to display, reveal, appear," from O.Fr. mostrer (modern Fr. montrer), from L. monstrare "to show," from monstrum "omen, sign" (see monster). Noun meaning "act of gathering troops" is c.1400. To pass musters (1570s) originally meant "to undergo military review without censure." To muster out "gather to be discharged from military service" is 1834, Amer.Eng. To muster up in the fig. and transf. sense of "gather, summon, marshal" is from 1620s. Related: Mustered; mustering.