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unbeknownst (adj.)
[unbeknownst 词源字典]
1833, vulgar formation from
unbeknown
(1630s). No clear reason for the
-st
, but since 19c. this has become the dominant form.
[unbeknownst etymology, unbeknownst origin, 英语词源]
[unbeknownst 词源字典]