隙

伺隙

sì xì

to wait for the opportunity

衅隙

xìn xì

enmity

间隙

jiàn xì

interval

隙缝

xì fèng

aperture

云隙光

yún xì guāng

crepuscular rays

乘隙

chéng xì

to seize an opportunity

仇隙

chóu xì

feud

冰隙

bīng xì

crevasse

嫌隙

xián xì

hostility

孔隙

kǒng xì

pore (geology)

气隙

qì xì

air vent

白驹过隙

bái jū guò xì

a white steed flits past a crack (idiom); How time flies!