one of these days

Adverb

not-comparable

One day, some day (especially in warning of a negative consequence).

Japanese Meaning

いつか、ある日 / そのうち、近いうちに / 否定的な結果や警告を含意する場合に用いられる

If you keep lying to me, one of these days I'm going to stop helping you.

嘘をつき続けるなら、そのうちあなたを助けるのをやめるよ。

Sense（1）

One day, some day (especially in warning of a negative consequence).

One of these days, he won't be so lucky.