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Actually, it's mind your PS and qs. It means, be careful and meticulous in what you say and how you behave.

When I was young, I did a little typesetting. Moveable type is lovely stuff, but it's the mirror image of the letters it prints; so a b in type looks like a d. Rotate a d, and you have a p; rotate a b and you have a q. Typesetters had to mind their PS and qs all the time.

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13y ago

What else can I help you with?