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Definition of mass verb from the Oxford Advanced American Dictionary

 

mass

 verb
verb
NAmE//mæs//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they mass
 
he / she / it masses
 
past simple massed
 
-ing form massing
 
 
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to come together in large numbers; to gather people or things together in large numbers (+ adv./prep.) Demonstrators had massed outside the embassy. Dark clouds massed on the horizon. mass somebody/something The general massed his troops for a final attack.
 
adjective the massed ranks of his political opponents
See mass in the Oxford Advanced Learner's Dictionary