Longman Dictionary of Contemporary English homepage

unbeknown

 adverb
     
un‧be‧known also un‧be‧knownst written [sentence adverb]

unbeknown to somebody

without that person knowing about it:
Unbeknown to him, his wife had been trying to phone him all morning.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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