p's and q's
plural noun
\ ˌpēz-ᵊn-ˈkyüz
\
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Definition of p's and q's
1
: something (such as one's manners) that one should be mindful of
better watch his p's and q's when I get a six-gun of my own— Jean Stafford
2
: best behavior
being on her p's and q's for two solid days was too much— Guy McCrone
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