"Ps Qs" is a commonly used phrase that means to pay attention to details or to be careful in one's actions. Synonyms for this phrase include "mind your manners", "read between the lines", "be on one's best behavior", "be mindful", "be attentive", "be cautious", "take heed", "be observant", and "be vigilant". Using these alternative phrases can improve communication and help to avoid overuse of the same phrase. So, the next time you want to remind someone to pay attention to what they are doing, you can use any of these synonyms for "ps qs".