사

Etymology 1
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Numeral

 * 1)  four

Usage notes
This numeral is sometimes considered unlucky because is homophonous with, the hanja for "death". This is common throughout East Asia.

Etymology 2
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Noun

 * 1)  company

Etymology 3
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Noun

 * 1)  death

Counter

 * 1)  out

Etymology 4
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Noun

 * 1) private or personal affair

Etymology 5
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Noun

 * 1)  history

Suffix

 * 1) history

Noun

 * 1) sol musical note

Etymology 7
Korean reading of various Chinese characters.