Definition of “know sth from sth” - English Dictionary

british dictionary

“know sth from sth” in British English

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know sth from sth

phrasal verb with know uk /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.)

(Definition of “know sth from sth” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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