It never rains but it pours

Proverbial Meaning: When bad things happen to us, other bad things seem to happen at the same time - one after another.

Literal Origins: When it rains it never just rains a little, but pours down. Bad weather generally makes people unhappy, so the thought of lots of rain is similar to the thought of lots of misfortunes.

Common Usage: This proverb is very well known and often quoted when someone experiences a run of bad luck or misfortunes.