misfortune,
bad luck unnecessary and unforeseen trouble resulting from an unfortunate event
accident anything that happens suddenly or by chance without an apparent cause; "winning the lottery was a happy accident"; "the pregnancy was a stroke of bad luck"; "it was due to an accident or fortuity"
near miss an accidental collision that is narrowly avoided
derailment an accident in which a train runs off its track
ground loop a sharp uncontrollable turn made by an airplane while moving along the ground
trip,
slip 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"
