An advantage or point is said to outweigh another if it's stronger and more important.
When we talk about something outweighing something else, it usually means one idea or reason has more power than another. For example, when deciding whether to go on a road trip or stay home for the weekend, you might think about how much money you'd save by staying home - that point could outweigh the fun of seeing new places. It's often used in discussions where there are two options and one is clearly better.
To exceed in weight or mass.
