未 wei4 未
雨 yu3 雨
绸 chou2 綢
缪 mou2 繆
  1. lit. before it rains, bind around with silk (idiom, from Book of Songs 詩經|诗经); fig. to plan ahead
  2. to prepare for a rainy day

Examples

未雨綢繆。
你最好未雨绸缪。

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