Amass

usgb/əˈmæs/Volume
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Time FactorPlay
Amass implies a gradual process, not instant accumulation. SlideShe amassed a decent collection of stamps over the decades.
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Large QuantityPlay
Use 'amass' when referring to larger quantities, not just a few items. SlideThe museum has amassed thousands of artifacts.
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Personal EffortPlay
Amassing often involves personal effort or skill in collection. SlideHe amassed a library of rare books through careful searching.