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3. not know from nothing

not know from nothing

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not know from nothing

Inf. to be stupid, innocent, and naive. (This nothing is not replaced with something. Usually used with don't, as in the examples.) Old John—he don't know from nothing. What do you expect from somebody who don't know from nothing?

See also: know, not, nothing

not know from nothing

in. to be stupid, innocent, and naive. (see also know from something.) Tom don’t know from nothing. He is really dense.

See also: know, not, nothing