amass

verb

ə-ˈmas 

amassed; amassing; amasses

transitive verb

1

: to collect for oneself : accumulate

amass a great fortune

2

: to collect into a mass : gather

must select rather than simply amass details

intransitive verb

: to come together : assemble

Dark clouds amassed over the city.

amasser noun

amassment

ə-ˈmas-mənt 

noun

Synonyms

• accumulate
• assemble
• bulk (up)
• collect
• concentrate
• congregate
• constellate
• corral
• garner
• gather
• group
• lump
• pick up
• round up

Examples of amass in a Sentence

They've amassed a wealth of information.

amassed a truckload of donations in the course of their canned food drive

Recent Examples on the Web

The service has amassed a library of over 1,800 titles through partnerships with more than 50 content providers, including 11 film institutes and national archives. —Naman Ramachandran, Variety, 17 May 2025

Even as firefighters were still battling the flames, the pair amassed more than 6,000 signatures, including from the likes of A-listers like LeVar Burton and Alison Brie, in support of their initiative. —Katie Campione, Deadline, 17 May 2025

All of those players entered the WNBA as rookies with huge follower counts amassed during their college careers. —Lev Akabas, Sportico.com, 15 May 2025

In just a matter of days, it's amassed over 16.8 million views and 3.7 million likes at the time of writing. —Alyce Collins, MSNBC Newsweek, 15 May 2025

Word History

Etymology

Anglo-French amasser, from a- (from Latin ad-) + masser to gather into a mass, from masse mass

First Known Use

15th century, in the meaning defined at transitive sense 1

Rhymes for amass

• alas
• bromegrass
• bypass
• chagas
• crabgrass
• crevasse
• eelgrass
• eyeglass
• groundmass
• harass
• impasse
• jackass

Kids Definition

amass

verb

ə-ˈmas 

: to collect into a mass : accumulate

amasser noun