v.1. To gather or tie something together in a tight package: He bundled up his belongings and left for college. She bundled her manuscript up and sent it to the publisher.
2. To wrap someone snugly in warm clothes or blankets: She bundled up the baby and laid him in the crib. He bundled the kids up and sent them out to play in the snow.
3. To dress snugly in warm clothes or blankets: I bundled up and went outside.