bunch up
Synonym discussion
Sense: phrasal verb/1
'Bunch up', 'huddle', 'cluster', 'crowd together', and 'bundle up' all describe forms of gathering, but they differ in feel and use. 'Bunch up' is the most neutral and versatile — it works for people, animals, and objects moving into a tight group. 'Huddle' adds warmth and purpose: people huddle for protection from cold or to discuss something privately. 'Cluster' suggests a round, decorative, or natural arrangement, often of things that belong together (flowers cluster; stars cluster). 'Crowd together' emphasises limited space and usually describes many people packed in. 'Bundle up' is very different — it means to dress warmly or to tie things into a bundle, not to form a group. For example: 'The students bunched up at the door when the bell rang' (neutral) vs. 'The players huddled to plan their next move' (purposeful) vs. 'The daffodils clustered around the old tree' (natural arrangement).
Etymology
'Bunch up' comes from 'bunch' (a cluster of things tied or growing together, from Old French 'bonge' meaning bundle) combined with the adverb 'up', which adds a sense of completion or bringing together. The phrasal verb has been used since the 1800s to describe people or objects gathering into a tight group.