not know from a b

A, a

[ey]
noun, plural A's or As, a's or as.
1.
the first letter of the English alphabet, a vowel.
2.
any spoken sound represented by the letter A or a, as in bake, hat, father, or small.
3.
something having the shape of an A .
4.
a written or printed representation of the letter A or a.
5.
a device, as a printer's type, for reproducing the letter A or a.
Idioms
6.
from A to Z, from beginning to end; thoroughly; completely: He knows the Bible from A to Z.
7.
not know from A to B, to know nothing; be ignorant.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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