not know one's ass from one's elbow
idiom
chiefly US, informal + impolite
: to know nothing : to be stupid
Don't take his word for it—he doesn't know his ass from his elbow.
Dictionary Entries Near not know one's ass from one's elbow
not know one's arse from one's elbow
not know one's ass from one's elbow
Cite this Entry
“Not know one's ass from one's elbow.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20know%20one%27s%20ass%20from%20one%27s%20elbow. Accessed 23 Nov. 2024.
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Merriam-Webster unabridged
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