The Saying 'Mind Your Ps And Qs' - Meaning And Origin.

1. Mind your pints and quarts. This is suggested as deriving from the practice of chalking up a tally of drinks in English pubs (on the slate). Publicans had to make sure to mark up the quart drinks as distinct from the pint drinks. This explanation is widely repeated but there’s little to support it, apart from the fact that pint and quart begin with P and Q.

2. Advice to printers’ apprentices to avoid confusing the backward-facing metal type lowercase Ps and Qs, or the same advice to children who were learning to write. I’ve never heard any suggestion that anyone should ‘mind their Ds and Bs’ though, even though that makes just as much sense and has the added benefit of rhyming, which would have made it a more attractive slogan. Nevertheless, the fact that handmade paper was an expensive commodity and that the setting of type in early presses was very time consuming makes the printing story a strong candidate. The fact that type had to be set upside down and backwards made the need for a warning to be careful doubly appropriate.

3. Mind your pea (jacket) and queue (wig). Pea jackets were short rough woollen overcoats, commonly worn by sailors in the 18th century. Perruques were full wigs worn by fashionable gentlemen. It is difficult to imagine the need for an expression to warn people to avoid confusing them.

‘Pee’, as a name for a man’s coarse coat, is recorded as early as 1485, so it is possible that that is what Dekker was referring to in his 1602 citation. If so, that usage long pre-dates all others and we have the definitive origin of ‘pee and kue’. ‘Kue’ or ‘cue’ as the name of a man’s wig isn’t known until well after 1602 though, so it still isn’t certain what Dekker meant by it.

4. Mind your pieds (feet) and queues (wigs). This is suggested to have been an instruction given by French dancing masters to their charges. This has the benefit of placing the perruque in the right context – as long as we accept the phrase as being originally French. However, there’s no reason to suppose it is from France and no version of the phrase exists in French.

5. Another version of the ‘advice to children’ origin has it that ‘Ps and Qs’ derives from ‘mind your pleases and thank-yous”. That is widely touted as an origin but seems to me to be a back-formation, that is, an explanation fitted to explain the phrase after it was coined in some other context. ‘Pleases and thank-yous’ doesn’t appear to lead to ‘Ps and Qs’.