Mill cannot grind with water that is past proverb
When you have the opportunity to do something, you should take it. Otherwise, you may regret or that chance will just be useless.
You ought not to squander this chance of baring your heart to Marry before any another man does that - the mill cannot grind with water that is past.
A: I denied the chance of buying the house when it was relatively cheap. However, now it is stupendously expensive. B: The mill cannot grind with water that is past, you know.
The origin of this proverb is not clear.
To be very wet
Because of forgetting bringing an umbrella, I look like a drowned rat when it rains.