Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Old French
Origin: amasser, from masser 'to gather into a mass'

amass

 verb
     
a‧mass [transitive]
if you amass money, knowledge, information etc, you gradually collect a large amount of it:
For 25 years, Darwin amassed evidence to support his theories.
He amassed a fortune after the war.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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