独ひとり決ぎめ

noun, noun or participle which takes 'suru', intransitive verb

deciding by oneself; arbitrary decision

Refers to making a decision alone without consulting others, often with a negative nuance of being self-centered or arbitrary.

• 彼かれはいつも独ひとり決ぎめで物もの事ごとを進すすめる。

  He always pushes things forward by deciding on his own.

• そんな大だい事じなことを独ひとり決ぎめしないでください。

  Please don't decide such an important matter by yourself.

noun, noun or participle which takes 'suru', intransitive verb

taking for granted; assuming

Used when someone unilaterally assumes something without confirmation, often leading to misunderstanding. Common in the phrase 独り決めする (to jump to a conclusion).

• 彼かの女じょが来くるものと独ひとり決ぎめして待まっていた。

  I waited, taking it for granted that she would come.

• 成せい功こうを独ひとり決ぎめしてはいけない。

  You must not assume success.