shí kū
rock cave
grotto
cliff caves (often with Buddhist statues)
kū long
hole
pocket
cavity
loophole
debt
mó kū
lit. nest of devils
place occupied by sinister forces
Mò gāo kū
Mogao caves in Dunhuang 敦煌, Gansu
Lóng mén shí kū
Longmen grottoes at Luoyang 洛陽|洛阳[Luo4 yang2], Henan
Wú gē kū
Angkor Wat, temple complex in Cambodia
Yún gāng shí kū
Yungang caves at Datong 大同, Shanxi 山西
jiǎo tù sān kū
lit. a crafty rabbit has three burrows
a sly individual has more than one plan to fall back on (idiom)
Dūn huáng shí kū
Dunhuang caves in Gansu
refers to Mogao caves 莫高石窟[Mo4 gao1 shi2 ku1]
Mài jī shān shí kū
Mt Maiji caves at Tianshui 天水, Gansu
xiāo jīn kū
money squandering establishment (e.g. gambling den, brothel etc)
sì dà shí kū
Four great caves, namely: Longmen grottoes 龍門石窟|龙门石窟[Long2 men2 shi2 ku1] at Luoyang, Henan, Yungang caves 雲岡石窟|云冈石窟[Yun2 gang1 shi2 ku1] at Datong, Shanxi, Mogao caves 莫高窟[Mo4 gao1 ku1] at Dunhuang, Gansu, and Mt Maiji caves 麥積山石窟|麦积山石窟[Mai4 ji1 shan1 shi2 ku1] at Tianshui, Gansu