Definition of “not that I know of” - English Dictionary

british dictionary

“not that I know of” in British English

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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 especially unhappy at school?" "Not that I know of."

(Definition of “not that I know of” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)