“细水长流”，汉语成语，字面意思是“water flowing out in a trickle takes a long time to exhaust”，比喻节约使用财物，精打细算。也形容一点一滴不间断地做某件事，长远打算。可以翻译为“stint (on) in order to ensure longer use，be economical，do something gradually but perseveringly”等。

例句：

用钱要细水长流。

Stint on money, or it may run short.