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pile up

part of speech: phrase
definition 1: to accumulate, with one thing on top of another.
The snow is really piling up outside.Dirty dishes are piling up in the sink.Chunks of river ice piled up at the dam.
definition 2: to gather (things) into a pile.
Why don't you pile up all those old magazines and put them in the recycling bin?He had just piled up all the leaves when the kids came and jumped in them.
definition 3: to accumulate as if in an increasing pile.
Things are piling up at work and I'm having to put in a lot of extra hours.The bills piled up because we couldn't pay them.