know one's ass from one's elbow
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English
[edit]Verb
[edit]know one's ass from one's elbow (third-person singular simple present knows one's ass from one's elbow, present participle knowing one's ass from one's elbow, simple past knew one's ass from one's elbow, past participle known one's ass from one's elbow)
- Synonym of know one's ass from a hole in the ground