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inoh

know one's ass from a hole in the ground

/nəʊ wʌnz æs fɹəm eː hɒl ən ðə ɡɹaʊnd/

Lack basic understanding or awareness.

“He doesn’t know his ass from a hole in the ground.”
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Illustration of know one's ass from a hole in the ground: Lack basic understanding or awareness.