amassing

WordReference Random House Learner's Dictionary of American English © 2025

a•mass /əˈmæs/   v. [~ + object]

1. to gather so as to keep for oneself:
   worked hard to amass a fortune.
2. to collect into a mass;
   accumulate:
   amassing sufficient evidence to convict the felon.

WordReference Random House Unabridged Dictionary of American English © 2025

a•mass  (ə mas′), v.t. 

1. to gather for oneself;
   collect as one's own:
   to amass a huge amount of money.
2. to collect into a mass or pile;
   gather:
   He amassed his papers for his memoirs.

v.i. 

3. to come together;
   assemble:
   crowds amassing for the parade.

• French amasser, equivalent. to a- a-⁵ + masse mass + -er infinitive suffix
• 1475–85

a•mass′a•ble, adj. 
a•mass′er, n. 
a•mass′ment, n. 
Synonyms

• 1. accumulate.
• 2. assemble, aggregate.

Collins Concise English Dictionary © HarperCollins Publishers::

amass / əˈmæs/ verb

1. (transitive) to accumulate or collect (esp riches, etc)
2. to gather in a heap; bring together

Etymology: 15th Century: from Old French amasser, from masse mass

aˈmasser noun