А13
НИ A3 А не знать, не смыслить, не понимать и т. п.
coll(НИ) АЗА В ГЛАЗА
obsoles,
collNP genthese forms onlyobj (to know, understand) absolutely nothing (about sth. )
not (know (understand)) a thing (the first thing) (about sth. )
not (have) the foggiest(the faintest) idea ( notion) (what
sth. is about
etc)not (know) the ABCs of
sth.not know from A to В about
sth.(in limited contexts) not (know) one's ABCs.
From the name of the first letter of the Church Slavonic alphabet.