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.
彼はいつも独り決めで物事を進める。
He always pushes things forward by deciding on his own.
そんな大事なことを独り決めしない
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).
彼女が来るものと独り決めして待っていた。
I waited, taking it for granted that she would come.
成功を独り決めしてはいけない。
You must not assume success.