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know from

   Also found in: Dictionary/thesaurus, Wikipedia 0.10 sec.
know someone from someone
to tell the difference between one person and another. I don't knowFred from his twin brother. I know Bill from Bob, but I can't tell most identical twins apart.
See also: know

know something from something

to tell the difference between one thing and another. (Often with a negative.) You don't know a smoked herring from a squid! She didn't know a raven from a crow, and who does?
See also: know

know from something

to know about something. (Used on the eastern seaboard.) Do you know from thermostats? You don't know from anything!
See also: know


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