lǎo mǔ zhū diào jìn gān shuǐ gāng lǐ——yǒu chī yǒu hēJDP汉语字典
淘水:淘米、洗菜、洗刷锅碗等用过的水。指有便宜可占,有好处可捞。多含嘲讽意。JDP汉语字典