en masse

en masse idiom
In one group or body; all together. For example, The activists marched en masse to the capitol. This French term, with exactly the same meaning, was adopted into English about 1800.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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