pile up1 phrasal verbphr v a) INCREASE IN ACTIVITY, FEELINGS ETCto increase in quantity or amount, in a way that is difficult to manage （使）堆积，（使）积累 It wasn’t long before the debts were piling up. 没多久就债台高筑了。
The traffic starts piling up around this time. 差不多这个时候交通就开始拥堵了。
The work has a tendency to pile up if I’m not careful. 我一不注意工作就会积压起来。
b) pile something ↔ up to arrange things in a pile 将〔某物〕堆积起来 tiny doughnuts piled up in a dish 堆放在盘子里的几个小甜甜圈
→ pileuppile up• The work just keeps on piling up and makes me want to scream.• As her debts piled up, she came close to a nervous breakdown.
→ pile up at pile2(PHRASAL VERB)
2 → variant of pileup at pileup