one day

idiom

1

: 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.

2

: 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

Don't expect to accomplish it all in one day. —Mary Marlowe Leverette, The Spruce, 10 Jan. 2026

The shooting in Portland comes one day after the death of Renee Nicole Good, who was fatally shot by ICE officer Jonathan Ross in Minneapolis, the Minnesota Star Tribune, Fox9 and The Intercept reported. —Charna Flam, PEOPLE, 9 Jan. 2026

But the tickets can be used on consecutive or nonconsecutive dates, and visitors can opt to visit a single WDW park on more than one day during the promotion. —Dewayne Bevil, The Orlando Sentinel, 9 Jan. 2026

And one day, give them a chance to see these same makes and models at the Detroit Auto Show in person. —Jack Springgate, CBS News, 9 Jan. 2026

Rhymes for one day

• aaa
• adonais
• alleyway
• alumnae
• anime
• anyway
• arete
• attache
• baa
• beaujolais
• bouvier
• breakaway