|Origin:||croisade and Spanish cruzada, both from Latin crux; CROSS2|
a determined attempt to change something because you think you are morally right [↪ campaign]
He seems to be running a one-man crusade against cigarette smoking.
2 also CrusadeRRC
one of a series of wars fought in the 11th, 12th, and 13th centuries by Christian armies trying to take Palestine from the Muslims