Definition of unbeknownst to
chiefly US
: without being known about by (someone)
Unbeknownst to the students, the teacher had entered the room.
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“Unbeknownst to.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unbeknownst%20to. Accessed 23 Jan. 2022.
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