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in unison

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1

In complete agreement, harmonizing exactly. For example, Their opinion was in unison with ours. [Early 1800s]

2

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.

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Which of the following words describes “sky blue”?
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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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