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en masse

adverb
 
 
/ˌɒ̃ˈmæs/ US  /ˌɑ̃ː-/

Definition

If a group of people do something en masse, they do it together and at the same time: The shop's 85 workers have resigned en masse.Acting, being or existing together
(Definition of en masse adverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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