Crossword Genius

Pile up (5)

Ross

I believe the answer is:

'pile up' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for amass that I've seen before include "run up?" , "Accrue, heap up" , "Get together" , "Collect, hoard" , "store" .)

I've seen this clue in the Universal, The Mirror, The Star Tribune, The Guardian and the LA Times.
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