bunch (something) up/together
phrasal verb with bunch verb uk/bʌntʃ/ us/bʌntʃ/
（使）聚拢;（使）挤成一团;（把…）聚成一堆
to move close together to form a tight group
The monkeys bunched together in their cage. 猴子在笼中挤成一团。
We were all bunched up at the back of the room. 我们都挤在房间的后面。