出事或出错to go awry; to make a mistake

• 当心，别出岔子。

  Take care not to make any mistakes.

• 但愿不要出岔子才好!

  Let's hope nothing goes wrong!

• 我担保不出岔子。

  I guarantee that nothing will go awry.

• 这是谁出的岔子?

  Who is responsible for this mistake?