in unison
Idioms-
In complete agreement, harmonizing exactly. For example, Their opinion was in unison with ours . [Early 1800s]
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Saying the same thing at the same time, simultaneously, as in The whole class answered in unison . [Late 1800s] Both usages allude to the unison of music, a single identical pitch.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
