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"amasses" is also used as a crossword clue. If that's what you saw, the answer is often accumulating (12 letters).
Definitions
Gathers a large amount gradually
Used in a sentence
“He amasses his wealth in secret.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Gathers gradually”7 letters
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