一人ひとり腹ばら

noun

taking for granted; rash conclusion

Used when someone jumps to a conclusion or assumes something without proper evidence, often in the phrase 一人腹を決める or similar constructions. Somewhat literary or old-fashioned.

• 彼かれは一人ひとり腹ばらを決きめて、私わたしが嘘うそをついたと思おもい込こんだ。

  He jumped to the rash conclusion that I had lied.

• 一人ひとり腹ばらで物もの事ごとを判はん断だんしてはいけない。

  You must not judge things by taking them for granted.