pile(sth)up
—phrasal verbwithpileverbuk/paɪl/us/paɪl/
(FORM A PILE)
toformapile, or to put a lot of things into apile
成为一堆；把…堆积起来
(INCREASE)
B2
(of somethingbad) toincrease
（使）（不好的事物）增加，（使）累积
Unpaidbillsbegantopileup alarmingly.未支付的账单越积越多，数目惊人。
Theypiledup such ahugedebtthat theysoonwentbankrupt.他们债台高筑，很快就破产了。