金屋藏娇（金屋藏嬌）　

◎ 金屋藏娇 jīnwū-cángjiāo

[keep a mistress in a love rest] 原指汉武帝幼时喜爱表妹阿娇,并欲建金屋让她居住一事,后以“金屋藏娇”指纳妾