斷袖之癖
Simplified:
断袖之癖
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lit. cut sleeve (idiom)
fig. euphemism for homosexuality, originating from History of Western Han 汉书: emperor Han Aidi (real name Liu Xin) was in bed with his lover Dong Xian, and had to attend a court audience that morning. Not wishing to awaken Dong Xian, who was sleeping with his head resting on the emperor's long robe sleeve, Aidi used a knife to cut off the lower half of his sleeve.
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