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to pile up
[phrase form: pile]
01
to increase in amount or quantity over time
02
to stack things on top of each other
03
to put a large quantity or group of things in one place or on top of one another
Example
Leaves piled up in the backyard during autumn.
Work assignments have been piling up since the manager went on vacation.
If you don't address your issues, they'll just pile up over time.
Bills just seem to pile up when you least expect it.
She piled up the dirty dishes in the sink.