one day

idiom

: at some time in the future

One day, it'll happen. You'll see.

People may one day be able to take vacations to the moon.

: on a day in the past

I went to her house one day and had lunch with her.

One day, we had a terrible argument.

Examples of one day in a Sentence

Recent Examples on the Web

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

As 2025 kicked off, just one day before Burton popped the question, Lundstrom took a moment to reflect on the past year with her then-boyfriend. —

Gil MacIas, People.com, 5 Jan. 2025 Like alternate side of the street parking in New York City, Trump has shown a considerable capacity to make deals one day while resorting to threats the next. —

Evan A. Feigenbaum, Forbes, 5 Jan. 2025 Thornton will get in the Hall, while Patrick Marleau might one day and Joe Pavelski should. —

Eric Stephens, The Athletic, 3 Jan. 2025 Related Articles Lopez, Costner and a few others made the rounds one day, and the Amazon founder and his fiancé Sanchez stopped in another day. —

Rosemary Feitelberg, WWD, 3 Jan. 2025 See all Example Sentences for one day