not know from (something)

(redirected from doesn't know from)

not know from (something)

To not know anything about something. From Yiddish, heard primarily on the East Coast of the US. Why don't you just stay out of this, OK? You don't know from running your own business. Ah, don't mind her, Phil. She doesn't know from nothing.
See also: know, not
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

know from something

in. to know about something. (see also not know from nothing.) Do you know from timers, I mean how timers work?
See also: know, something
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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