To bundle means to gather things together and tie or wrap them into a single package. You might bundle newspapers with string, or bundle firewood with rope to carry it more easily. When it's freezing outside, you bundle up by wrapping yourself in layers of warm clothing: coat, scarf, hat, and gloves all working together to keep you warm.

Companies also use bundling as a sales strategy. Instead of buying a phone, a case, and headphones separately, you might buy them as a bundle for one price. Streaming services might bundle movies, shows, and music together in one subscription. Video game companies sometimes sell bundles that include the game plus extra content.

The word bundle can also be a noun: a bundle of sticks, a bundle of joy (a sweet way to describe a new baby), or a bundle of nerves (someone who's very anxious). When someone says a purchase cost “a bundle,” they mean it was expensive.

The key idea behind bundling is bringing separate things together into one convenient package, whether that's physical objects tied with string or different products combined into a single deal.