mind one`s P`s and Q`s - to be very careful about what one does or says

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What is mind one`s P`s and Q`s?
mind one`s P`s and Q`s is " to be very careful about what one does or says", under mind-one`s-P`s-and-Q`s
mind one`s P`s and Q`s Definition / mind one`s P`s and Q`s Means
The definition of mind one`s P`s and Q`s is " to be very careful about what one does or says"
The Meaning of mind one`s P`s and Q`s
mind one`s P`s and Q`s means " to be very careful about what one does or says"
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We've found a total of 1 definitions for mind one`s P`s and Q`s mind one`s P`s and Q`s to be very careful about what one does or says in Idioms

What does mind one`s P`s and Q`s in Idioms_mind stand for?