not  know  one's ass from one's elbow
<i>not</i>
nɒt
not
know
nəʊ
new
<i>one's</i>
wʌnz
vanz
ass
æs
ās
from
frɒm
from
<i>one's</i>
wʌnz
vanz
elbow
ɛlbəʊ
elbew

英語での「not know one's ass from one's elbow」の定義と意味

not know one's ass from one's elbow
01

to be incapable of understanding even the simplest concepts 

{not} [know] {one's} ass from {one's} elbow definition and meaning
慣用句
不快感を与える
Don't ask him to set up the printer; he doesn't know his ass from his elbow when it comes to computers. 
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