c.1300, from O.Fr. *desmaier, from L. de- intensive prefix + O.Fr. esmaier "to trouble, disturb," from V.L. *exmagare "divest of power or ability," from P.Gmc. stem *mag- "power, ability" (cf. O.H.G. magen "to be powerful or able;" see
may (v.)). Related: Dismayed.