ドジを踏ふむ

expression, godan verb (-mu)

make a blunder; mess up; bungle

Colloquial expression for making a careless or foolish mistake, often with a sense of self-deprecation or mild criticism.

• またドジを踏ふんで、書しょ類るいを間ま違ちがえて送おくってしまった。

  I messed up again and sent the wrong documents.

• 大だい事じなプレゼンでドジを踏ふまないように、しっかり準じゅん備びしよう。

  Let's prepare thoroughly so we don't make a blunder in the important presentation.