Ak akçe kara gün içindir.
- Save up something for a rainy day.
Kara gün için para biriktirin.
- Save money for a rainy day.
Why don't you buy a new car? / No, I'm saving my money for a rainy day. I don't want to be caught in a bad position.
I've kept some money in the bank for a rainy day.
Rainy days and Mondays always get me down.