Wordnet 3.0
NOUN (1)
1. 
 an unintentional but embarrassing blunder; 
- Example: "he recited the whole poem without a single trip"- Example: "he arranged his robes to avoid a trip-up later"- Example: "confusion caused his unfortunate misstep"[syn: trip, trip-up, stumble, misstep]
WordNet (r) 3.0 (2006):
trip-up
    n 1: 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" [syn: trip, trip-up, stumble,
         misstep]