slip up   (TTS發音)

make a mistake失誤

    If he had not slipped up on the last question， his score on the test would have been perfect. 最後一個問題如果他沒出現失誤的話，他的考試成績就是滿分了。

    Be careful you don't slip up through overconfidence. 小心，別因過分自信而犯錯誤。

    He slipped up over that problem. 他在那個問題上搞錯了。