あやまちを おか
ayamachio okasu

Godan Verb (su)
Expression

1. to make an error

かれ 注意 ちゅうい あやまちをおかす、しかも頻繁 ひんぱんにだ。
karewa fuchūina ayamachio okasu shikamo himpannida.
He makes careless mistakes, and does so frequently.