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say it: uhn-bi-NOHN
unbeknown is an adjective and adverb meaning "(usually used with `to') occurring or existing without the knowledge of". It carries 2 recorded senses.
(usually used with `to') occurring or existing without the knowledge of
“a crisis unbeknown to me”
“she had been ill for months, unbeknownst to the family”
Definitions, synonyms and semantic relations for unbeknown come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.