Other forms: overburdened; overburdening; overburdens
When you give someone too much to carry, you overburden them. Don't overburden yourself with too much gear in your hiking backpack, or you'll never make it up the mountain!
You can literally overburden someone, which you do whenever you ask them to hold too much weight: "Let me carry some of those books. I don't want you to overburden yourself" There's also a figurative way to overburden another person, by pressuring them or making them work too hard: "If the budget cuts go through and school aides are laid off, it will overburden teachers."