一ひと言こと多おおい

expression, i-adjective

saying too much; having a big mouth; adding unnecessary remarks

Describes a person who habitually adds an extra, often unwelcome or tactless, comment beyond what is needed. Used as a fixed adjective-like phrase.

• 彼かれは一ひと言こと多おおいから、会かい議ぎでよくトラブルになる。

  He always says one word too many, so he often causes trouble in meetings.

• あの人ひとは一ひと言こと多おおい性せい格かくで、つい余よ計けいなことを言いってしまう。

  That person has a habit of saying too much and ends up blurting out unnecessary things.