One will go to 地獄 for the “cutting moo” mnemonic 
Just by hearing the word I imagine in my head a person leaning against a wall by shoulder.
Isn’t the word literally 肩 + 向く ?
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Kojien apparently reckons it’s from 片向く.
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Indeed, and it’s obviously related to 偏る which is a respelling of 片寄る.
It’s one of those annoying cases where the habit of Japanese to pick the closest matching Chinese character by semantics effectively obfuscates the relationship between the words.
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Could be worse, we could still be using man’yougana. 日本国語大辞典 has an 8th century citation for かたよる which writes it 可多与留 
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