not that I know of Definition in the Cambridge English Dictionary
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Definition of “not that I know of” - English Dictionary

Definition of "not that I know of" - British English Dictionary

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not that I know of

used when ​answering a ​question to ​mean that, ​judging from the ​information you have, the ​answer is no: "Is she ​especiallyunhappy at ​school?" "Not that I know of."
(Definition of not that I know of from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “not that I know of”
in Chinese (Simplified) 据我所知并非如此,据我所知没有…
in Chinese (Traditional) 據我所知並非如此,據我所知沒有…