Why do we say "It Never Rains But It Pours"?

Meaning:

When troubles come, they tend to come together

Background:

No doubt, this sentiment has been expressed for many thousands of years. However, one early use is recorded in 1726 when the Scottish physician, satirist and polymath, John Arbuthnot (~1667-1735) wrote, "It Cannot Rain But It Pours".

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