Meaning
Supposing; what if — used to introduce a hypothetical situation to reason about. 'Supuozin rain fall, wah wi a go do?' means supposing it rains, what will we do? It sets up an imagined case so that its consequences can be weighed and talked through. The Patois pronunciation of 'supposing', it is a common everyday word for entertaining a possibility, floating a 'what if' to think ahead, plan, worry, or argue out how things might turn if some circumstance came to pass.
Examples
-
Supuozin him nuh come, who a go help?
Supposing he doesn't come, who's going to help?
-
Supuozin yuh did win di lotto, wah yuh buy?
Supposing you'd won the lottery, what would you buy?
-
Supuozin di worse happen, wi still deh yah.
Supposing the worst happens, we're still here.
Origin
The Patois pronunciation of 'supposing' (introducing a hypothetical).
How it’s used
Means 'supposing / what if'; introduces a hypothetical. Compare 'mussi', 'if'.