Definition from Wiktionary, the free dictionary
- (transitive, intransitive) To dress in, or put on, warm clothes.
1916, Alice Hale Burnett, chapter IV, in Christmas Holidays at Merryvale:
- "Come, boys, bundle up well, because it's going to be a cold drive." "I'll run ahead to get the others,"
- (transitive) To put into a bundle.