n. 25B6; noun
the medieval crusades : HOLY WAR; Islam jihad.
a crusade against crime : CAMPAIGN, drive, push, movement, effort, struggle; battle, war, offensive.
25B6; verb she likes crusading for the cause of the underdog : CAMPAIGN, fight, do battle, battle, take up arms, take up the cudgels, work, strive, struggle, agitate, lobby, champion, promote.