"deeply humiliated," 1717, past-participle adjective from mortify. Earlier it meant "dead to sin or the world" (early 15c.); "gangrenous" (late 14c.).
1919, short for demobilize. Originally in reference to troops returning to civilian life at the end of World War I. Related: Demobbed.
1720, the offensive, "condition of attacking, an aggressive action or course," from offensive (adj.). Military sense of "forceful action toward a particular end" is by 1918, from World War I.