Pile Up
WordNet

verb


(1)   Collect or gather
"Journals are accumulating in my office"
"The work keeps piling up"
(2)   Arrange into piles or stacks
"She piled up her books in my living room"
(3)   Get or gather together
"I am accumulating evidence for the man's unfaithfulness to his wife"
"She is amassing a lot of data for her thesis"
"She rolled up a small fortune"
WiktionaryText

Verb


pile up
  1. To form a pile, stack, or heap.
    The kids piled up their boots and coats by the back door.
  2. To collect or accumulate, as a backlog.
    The requests piled up while she was away.
 
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