noun. ['kruːˈseɪd'] a series of actions advancing a principle or tending toward a particular end.
verb. ['kruːˈseɪd'] go on a crusade; fight a holy war.
verb. ['kruːˈseɪd'] 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.