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Phrase(s): have an accident
1. to experience something that was not foreseen or intended. • Traffic is very bad. I almost had an accident. • Drive carefully. Try to avoid having an accident. 2. Euph. to lose control of the bowels or the bladder. (Usually said of a young child.) • "Oh, Ann," cried Mother. "It looks like you’ve had an accident!" • Mother asked Billy to go to the bathroom before they left so that he wouldn’t have an accident in the car.
McGrawhill's American Idioms And Phrasal Verbs