bunch2 also bunch together, bunch up
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.
to hold or tie things together in a bunch