Meaning
Don't watch anyone's face — that is, don't be intimidated by, or show favour to, anybody. Do what you have to do without fear of who is watching and without treating some people differently because of their status. Stand your ground and show no partiality.
Examples
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Do di right ting an nuh watch nuh face.
Do the right thing and don't be swayed by anyone.
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Mi nah fraid a dem — mi nuh watch nuh face.
I'm not afraid of them — I show no one special treatment or fear.
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Treat everybody di same; nuh watch nuh face.
Treat everyone the same; show no partiality.
Origin
To 'watch someone's face' is to be guided by their reaction — to defer, fear, or favour; 'nuh watch nuh face' rejects that, meaning to act boldly and impartially regardless of who is present.
How it’s used
An assertion of fearless impartiality — doing what's right without deferring to anyone's status.