en masse|masse Idiom, Proverb
en masse|masse
adv. phr. As a group; in one big mass or group.

Used after the word it modifies.
The school turned out en masse to cheer the returning astronaut.en masse|masse
adv. phr. As a group; in one big accumulation or group.

Used afterwards the chat it modifies.
The academy angry out en masse to acclamation the abiding astronaut. Dictionary