Open English Wordnet
Nouns
(n)trip, trip-up, stumble, misstepan 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” Verbs
(v)stumble, tripmiss a step and fall or nearly fall“She stumbled over the tree root” (v)stumble, hitencounter by chance“I stumbled across a long-lost cousin last night in a restaurant”