spend money like water

spend money like water (third-person singular simple present spends money like water, present participle spending money like water, simple past and past participle spent money like water)

1. (informal, simile) To spend a lot of money without concern over whether it is spent wisely.

   Synonyms: spend money like there was no tomorrow, spend money like it's going out of fashion

• hand over fist
• have money to burn

• “spend money like water” (UK) in Macmillan English Dictionary.
• “spend money like water”, in Collins English Dictionary.
• “like water” in Longman Dictionary of Contemporary English, Longman.