The phrase "When it rains, it pours" is a proverb meaning that misfortunes or difficult situations tend to come all at once or in rapid succession. It can also apply to positive things, but it's more often used negatively. Examples: "I missed my bus, spilled coffee on my shirt, and then my laptop died — when it rains, it pours." "After months of no job offers, she suddenly got three in one week. When it rains, it pours!"