We found one dictionary that defines the word mind their p's and q's:

General (1 matching dictionary)

1. mind their p's and q's: Merriam-Webster

▸ Words similar to mind their p's and q's ▸ Usage examples for mind their p's and q's ▸ Idioms related to mind their p's and q's ▸ Wikipedia articles (New!) ▸ Words that often appear near mind their p's and q's ▸ Rhymes of mind their p's and q's ▸ Invented words related to mind their p's and q's