一ひとつ事こと

ひ

と

つ

こ

と

Meanings

1

the same thing; one single thing

Refers to something that is identical or limited to one item; often used in contexts emphasizing repetition or singularity.

彼かれはいつも一ひとつ事ことばかり言いっている。
He always says the same thing over and over.
一ひとつ事ことにこだわりすぎないほうがいい。
It's better not to obsess too much over one single thing.