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inoh

know one's ass from a hole in the ground

/nəʊ wʌnz æs fɹəm eː hɒl ən ðə ɡɹaʊnd/

have basic understanding or competence

“One must know one's ass from a hole in the ground.”
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know one's ass from a hole in the ground 일러스트: have basic understanding or competence