not know one's arse from one's elbow
idiom
British, informal + impolite
: to know nothing : to be stupid
Don't take his word for it—he doesn't know his arse from his elbow.
Dictionary Entries Near not know one's arse from one's elbow
not know one's arse from one's elbow
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“Not know one's arse from one's elbow.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20know%20one%27s%20arse%20from%20one%27s%20elbow. Accessed 24 Apr. 2024.
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Merriam-Webster unabridged
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