PHRASAL VERB-ERG （使）集中；（使）挤在一起 If people or things bunch up or bunch together, or if you bunch them up or bunch them together, they move close to each other so that they form a small tight group. （使）集中；（使）挤在一起
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They were bunching up, almost treading upon each other's heels. [VERB PREP.]
他们几乎脚尖踩着脚跟地挤作一团。
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People were bunched up at all the exits. [VERB-ed PREP.]
所有的出口都挤满了人。
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If they need to bunch aircraft more closely together to bring in one that is short of fuel, they will do so. [VERB noun PREP.]
如果需要将飞机挨得更紧一些好使其中那架燃油不足的飞机不致掉队，他们会这么做的。