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bunch someone or something up
to pack or cluster things or people together. Bunch them up so you can squeeze them into the sack. Kelly bunched up the roses and put them in a vase.
to pack together or cluster. Spread out. Don't bunch up!
1. To move close together to form a tight group; cluster: The kids bunched up in a corner of the room, whispering to each other.
2. To pack some people or things together tightly: Bunch up the blankets and stuff them into the bag. I didn't like what I had written on the page, so I bunched it up and threw it out.
3. To come together or be more concentrated in one place: The cloth bunches up at the cuff of my shirt.