Definition of mass verb from the Oxford Advanced Learner's Dictionary

 

mass

 verb
verb
BrE BrE//mæs//
 
; NAmE NAmE//mæs//
 
Verb Forms present simple I / you / we / they mass
BrE BrE//mæs//
 
; NAmE NAmE//mæs//
 
he / she / it masses
BrE BrE//ˈmæsɪz//
 
; NAmE NAmE//ˈmæsɪz//
 
past simple massed
BrE BrE//mæst//
 
; NAmE NAmE//mæst//
 
past participle massed
BrE BrE//mæst//
 
; NAmE NAmE//mæst//
 
-ing form massing
BrE BrE//ˈmæsɪŋ//
 
; NAmE NAmE//ˈmæsɪŋ//
 
 
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[intransitive, transitive] 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. Their troops were massing for war. mass somebody/something The general massed his troops for a final attack. Word Origin late Middle English: from Old French masse, from Latin massa, from Greek maza ‘barley cake’; perhaps related to massein ‘knead’.
See the Oxford Advanced American Dictionary entry: mass