live happily ever after
Spend the rest of one's life in happiness, as in In her romantic novels the hero and heroine end up marrying and then live happily ever after. This hyperbolic phrase ends many fairy tales. [Mid-1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.