to put one's foot in one's mouth, to be like a bull in a china shop, to hit the wrong note (to broach a sensitive topic in an inappropriate setting, where that topic is taboo; to be completely tactless)
archaic spelling of parlerais, first-person singular conditional of parler; archaic spelling of parlerais, second-person singular conditional of parler
archaic spelling of parlais, first-person singular imperfect indicative of parler; archaic spelling of parlais, second-person singular imperfect indicative of parler