To comment on issues of right and wrong, typically with an unfounded air of superiority. He tends to moralize about the importance of honesty, even though he often lies himself.
To interpret or explain something in a moral context. The teacher tried to moralize the story, highlighting the ethical lessons it contained.
To improve the moral character or behaviour of (a person or group); to make more virtuous. The reformers sought to moralize society through education and public campaigns.