Translation guide
The English phrase 'one of these days' refers to an unspecified day in the near future, often with a sense of vague intention or mild threat. In Japanese, there is no single direct equivalent; instead, various expressions convey similar meanings depending on context.
Expressing that you intend to do something in the near future, without specifying exactly when.
Literally 'within the near time', this is the most common and natural way to say 'one of these days' when referring to a vague near-future plan.
近いうちにまた会いましょう。
Let's meet again one of these days.
I'll return that book one of these days.
Means 'sooner or later' or 'eventually'. More casual and vague than 近いうちに. Often used when the timing is truly uncertain.
そのうち雨がやむでしょう。
It'll stop raining one of these days.
そのうち彼もわかるよ。
He'll understand one of these days.
Means 'someday'. Can be used for both near and distant future, but with 近いうちに it becomes more specific. Alone, it's more like 'someday' than 'one of these days'.
いつか日本に行きたい。
I want to go to Japan one of these days.
Implying that something unpleasant will happen to someone if they continue a certain behavior.
A set phrase meaning 'you'll get hurt one of these days' or 'you'll be sorry'. Used as a warning.
そんな運転してると、そのうち痛い目にあうよ。
If you keep driving like that, one of these days you'll be sorry.
Similar to the above, but uses いつか for 'someday'. Slightly more formal or literary.
彼はいつか痛い目を見るだろう。
He'll get what's coming to him one of these days.
Wishing that something good will happen eventually, often with a sense of patience.
Means 'someday for sure'. Adds emphasis to the hope. Often used in encouraging contexts.
いつかきっと夢が叶うよ。
One of these days your dream will come true.
A common encouraging phrase meaning 'good things will happen one of these days'.
落ち込まないで。そのうちいいことがあるよ。
Don't be down. One of these days something good will happen.
近いうちに implies a relatively near future, often within days or weeks. そのうち is more vague and can refer to a longer, indefinite period. いつか is the most general 'someday' and can refer to any time in the future, near or far.
近いうちにご飯に行きませんか？
Would you like to go out for a meal one of these days?
そのうち彼も来るでしょう。
He'll come one of these days (eventually).
いつか宇宙旅行がしたい。
I want to go to space someday.
There is no direct word-for-word translation of 'one of these days'. Avoid literal translations like これらの日の一つ, which is nonsensical. Use the phrases provided based on context.
近いうちにガレージの掃除をしようと思ってる。
One of these days I'll get around to cleaning the garage.
そのうち私に感謝するよ。
One of these days you'll thank me.