mishap
n.a small accident or a mistake that causes a little trouble. It is a more formal way to say 'accident'.
n.a minor accident or an unfortunate incident that causes a small amount of trouble or inconvenience.
“The small mishap did not delay the train.”
“The team's victory was almost ruined by a minor mishap during the final minutes of the game.”
“While the overall mission was a success, a minor mishap with the satellite's solar panels required an emergency patch to the software before the data could be transmitted.”
“Mount Fuji, which stands at a height of 3,776m (12,389ft), has been the site of a number of climbing mishaps in recent years.”
From Middle English mishap, myshappe, myssehappe, equivalent to mis- + hap.
From Middle English mishappen, equivalent to mis- + hap.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.