pile upRate this phrase:(4.00 / 2 votes)Say it
To collect or accumulate, as a backlog.

The requests piled up while she was away.

Additional definitions for 'pile up':

pile upTo form a pile, stack, or heap.
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"pile up." Phrases.net. STANDS4 LLC, 2018. Web. 23 Mar. 2018. <http://www.phrases.net/phrase/pile-up_1065>.

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