faux pas \faux` pas"\ (f[=o]` p[.a]"). [F. See False, and
Pas.]
A false step; a mistake or wrong measure; especially, a slip
or misstep in social etiquette; a blunder in conduct or
manners that causes embarassment; as, he committed the faux
pas of mentioning John's former wife.
[1913 Webster +PJC]