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English definition of “know sth from sth”

know sth from sth

phrasal verb with know     /nəʊ/ US  /noʊ/ verb (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.)Knowing and learning
(Definition of know sth from sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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