wèi yǔ chóu móu
lit. before it rains, bind around with silk (idiom, from Book of Songs 詩經|诗经); fig. to plan ahead
to prepare for a rainy day
未
wèi
not yet
雨
yǔ
rain
绸
chóu
(light) silk
缪
móu
used in 綢繆|绸缪[chou2 mou2]