Mind your Ps and Qs is an English expression meaning "mind your manners", "mind your language", "be on your best behaviour" or similar.
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Famous quotes containing the word mind:
“[The election] ... was an event in which, so far as the personal side is concerned, the victory was to him who lost and the defeat to him who won. I can say that never in the last fifteen years have I had the peace of mind that I have since the election. I have almost a feeling of elation.”
—Herbert Hoover (1874–1964)