胸むな算ざん用よう

noun, noun or participle which takes 'suru'

rough mental estimate; calculating in one's head

Refers to making a rough calculation or estimate mentally, often without precise figures. Can be used as a noun or with する.

• 旅りょ費ひを胸むな算用ざんようする。

  I make a rough estimate of the travel expenses in my head.

• 胸むな算ざん用ようでは足たりると思おもったが、実じっ際さいは予よ算さんオーバーだった。

  I thought it would be enough by my rough mental calculation, but in reality it was over budget.

noun, noun or participle which takes 'suru'

expectation; anticipation

Used for expectations or anticipations, often with a nuance of hopeful or wishful thinking. Less common than the 'rough estimate' sense.

• 彼かれの胸むな算ざん用ようは外はずれて、がっかりした。

  His expectations were off the mark, and he was disappointed.