unbeknown to

idiom

Definition of unbeknown to

chiefly British
: without being known about by (someone) Unbeknown to the students, the teacher had entered the room.

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“Unbeknown to.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unbeknown%20to. Accessed 7 Aug. 2020.

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