pile up

verb

1. 1

   collect or gather

   Journals are accumulating in my office

   The work keeps piling up

2. 2

   arrange into piles or stacks

   She piled up her books in my living room

3. 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