crusade
noun.
a series of actions advancing a principle or tending toward a particular end
he supported populist campaigns|they worked in the cause of world peace|the team was ready for a drive toward the pennant|the movement to end slavery|contributed to the war effort
noun.
any of the more or less continuous military expeditions in the 11th to 13th centuries when Christian powers of Europe tried to recapture the Holy Land from the Muslims
verb.
exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for
The liberal party pushed for reforms|She is crusading for women's rights|The Dean is pushing for his favorite candidate
verb.
go on a crusade; fight a holy war