The expression “mind your Ps and Qs” means to be careful about one’s behavior, manners, or language. Used today in offices, classrooms and dinner tables alike, it acts as a gentle reminder to stay polite and attentive, especially in social settings.
The origins of the phrase are debated, with several plausible explanations. One popular theory traces it to English pubs in the 17th and 18th centuries, where bartenders kept tabs on customers’ consumption of pints (Ps) and quarts (Qs). Patrons were advised to keep track of their orders and settle their dues correctly.
Another explanation comes from early printing practices, where apprentices had to be cautious not to confuse the lowercase letters “p” and “q,” which are mirror images. The lowercase “p” and “q” were notoriously easy to confuse. Flip one and you get the other! Another theory points to classrooms, where children learning to write were reminded to distinguish between similar-looking letters.
Yet another theory comes from France, where dancing masters instructed their students to mind their pieds (feet) and queues (wigs or coat-tails). These were two things a gentleman absolutely could not afford to get wrong in polite Parisian society.
While no single origin is definitively proven, each theory reflects a common thread: attention to detail. Over time, the phrase evolved into a broader reminder to act with care, precision, and good manners.
