behind someone's back
idiom
: without someone's knowledge : in secret
You shouldn't gossip about people behind their back(s).
She went behind his back and spoke directly to his supervisor.
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“Behind someone's back.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/behind%20someone%27s%20back. Accessed 15 Dec. 2024.
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