Amass means bring together or assemble. It can be a real shock to enter a room and see your amassed friends shouting "Surprise!"

Although the word amass should not be confused with "a mass," as in the thing you never want to hear has been found on your lung, they both derive from the Latin massa "lump." When you think about it, this makes sense. Whether soldiers or cancer cells, things that come together to form a whole — in this case, a tumor or an army — are amassed.

Definitions of amass
  1. verb
    collect or gather
    synonyms: accumulate, conglomerate, cumulate, gather, pile up
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    accumulate and create a backlog
    grow or become attached by accretion
    be piled up in banks or heaps by the force of wind or a current
    type of:
    become bigger or greater in amount
  2. verb
    get or gather together
    “She is amassing a lot of data for her thesis”
    synonyms: accumulate, collect, compile, hoard, pile up, roll up
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    run up
    pile up (debts or scores)
    collect or gather
    collect, pull in
    get or bring together
    come up, scrape, scrape up, scratch
    gather (money or other resources) together over time
    chunk, lump
    put together indiscriminately
    make into a bale
    take in and retain
    accumulate a fund for the discharge of a recurrent liability
    place or store up in a fund for accumulation
    archive, file away
    put into an archive
    accumulate gradually
    beat up, drum up, rally
    type of:
    hive away, lay in, put in, salt away, stack away, stash away, store
    keep or lay aside for future use
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