it never rains but it pours|pour|pours|rain|rains イディオム
it never rains but it pours|pour|pours|rain|rains
One good thing or bad thing is often followed by others of the same kind.

A proverb,
John got sick, then his brothers and sisters all got sick. It never rains but it pours.it never rains but it pours|pour|pours|rain|rains
One acceptable affair or bad affair is generally followed by others of the aforementioned kind.

A proverb,
John got sick, again his brothers and sisters all got sick. It never rains but it pours. Dictionary