Meaning
'Rain neva fall a one man door' — rain does not fall only on one man's doorstep. Trouble and misfortune come to everyone in their turn, the proverb consoles and warns: you are not singled out for hardship, and those who trouble or gloat over you today will meet their own hard times tomorrow. It offers comfort to the afflicted, that suffering is shared and no one escapes it forever, and a caution to the fortunate, that their easy day will not last and their turn for rain will come.
Examples
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Nuh feel seh a only yuh have problem; rain neva fall a one man door.
Don't feel like you're the only one with problems; hardship comes to all.
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Dem a laugh at mi now, but rain neva fall a one man door.
They're laughing at me now, but their turn will come.
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Everybody get dem share a trouble; rain neva fall a one man door.
Everyone gets their share of trouble; misfortune spares no one.
Origin
A weather image: rain falls across the whole district, not on a single house — so hardship visits every door in time.
How it’s used
Used to console someone in trouble, and to warn the smug that their turn for hardship will come too.