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 of amass

• collect
• gather
• assemble
• accumulate
• garner

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

News of the memo comes as the United States simultaneously seeks to strike a nuclear deal with Iran, while amassing enormous military force in the region that has been widely interpreted as a sign the Islamic Republic will be hit with strikes should the talks go nowhere. —Molly Parks, The Washington Examiner, 27 Feb. 2026

Praised for its vibrant and modern depiction of Black love, the series has amassed a devoted global readership. —Denise Petski, Deadline, 27 Feb. 2026

Washington is ramping up pressure on Tehran, amassing aircraft and warships in the Middle East, and sanctioning more than 30 entities that support Iranian oil and weapons sales. —J.d. Capelouto, semafor.com, 26 Feb. 2026

Tehran is expected to deliver a new proposal on nuclear enrichment in Geneva as the United States continues to amass military forces in the Middle East. —Karen Deyoung, Washington Post, 26 Feb. 2026

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