rainy day   (TTS發音)

a time of need，esp. a time when money may be needed困難的時候，尤指缺錢的時候

    I don't spend my whole salary. I put some in the bank for a rainy day. 我不花光全部工資，在銀行裡存些錢以備不時之需。

    Each week he saved a little money for a rainy day. 每週他節省點錢以備急用。