1. To marry someone who is more attractive, intelligent, capable, of a higher social class or standing, etc., compared to oneself. He always jokes when he's out with his wife that he married up. Don't say you married up—that implies that I just settled for someone who isn't as good as me.

2. To join, combine, or integrate two different things or elements together in a way that is mutually beneficial. We're marrying up traditional techniques with bleeding-edge technologies to deliver a range of products that are both modern and timeless. This merger will marry up the strengths of both our companies, providing an even better experience to our customers.