misstep(n = noun.act) stumble, trip, trip-up - an unintentional but embarrassing blunder; "he recited the whole poem without a single trip"; "he arranged his robes to avoid a trip-up later"; "confusion caused his unfortunate misstep"
is a kind of bloomer, blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall

   A wrong step; an error of conduct. [1913 Webster]

   To take a wrong step; to go astray. [1913 Webster]

misstep, n.
1 a wrong step or action.
2 a faux pas.