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In a sentence
Povedal to masovo.
He said it en masse.
Pri práci postupovala masovo.
She worked en masse.
Na otázku reagoval masovo.
He responded to the question en masse.
Celý deň sa správal masovo.
He behaved en masse all day.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.