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English definition of “know sth from sth”

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know sth from sth

verb uk phrasal verb with know   /nəʊ/ us    /noʊ/ (knew, known)
to know the difference between two things and therefore be able to recognize either, used especially to mean that you have a good knowledge and understanding of a particular subject: Computer expert? He doesn't know a mouse from a modem! (= He knows nothing about computers.)
Translations of “know sth from sth”
in Chinese (Traditional) 辨別, 識別…
in Chinese (Simplified) 辨别, 识别…
(Definition of know sth from sth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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