Meaning
'It's not so / that's not how it is' — a correction or denial, built from 'a' (it is), 'nuh' (not), and 'so' (thus). It contradicts a claim: 'a nuh so it go' means 'that's not how it goes'. Its positive counterpart is 'a so it go' (that's how it is). A quick, firm way to set the record straight.
Examples
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A nuh so it happen, mek mi tell yuh di truth.
That's not how it happened; let me tell you the truth.
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Dem seh mi did deh deh, but a nuh so.
They say I was there, but that's not so.
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A nuh so mi mean it.
That's not how I meant it.
Origin
From 'a' (it is) + 'nuh' (not) + 'so' (thus); a denial/correction. See [[a-so-it-go]], [[how-yuh-mean]].
How it’s used
'It's not so / that's not how it is'; opposite of 'a so it go'. See [[a-so-it-go]].