bunch 2 BrE AmE ( also bunch together , bunch up ) verb
1 . [intransitive and transitive] to stay close together in a group, or to make people do this:
The children bunched together in small groups.
John stopped, forcing the rest of the group to bunch up behind him.
2 . [intransitive and transitive] to make part of your body tight, or to become tight like this:
Sean bunched his fists.
3 . [intransitive and transitive] to pull material together tightly in folds:
She bunched the cloth up and threw it away.
4 . [transitive] to hold or tie things together in a bunch