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

On Monday, April 28, one day before his arrest, Farthing and his mother were announced as the winners of a $167.3 million Powerball jackpot. —Fernando Cervantes Jr., USA Today, 3 May 2025

If a decision still has not been made after three days, a break of up to one day is permitted, allowing for prayer and discussion amongst cardinals. —Callum Sutherland, Time, 3 May 2025

Haack and Larocca’s appearance occurred one day after Larocca’s ex, Andrea Deanna, spoke with the Daily Mail, claiming that Haack cheated on her ex-husband Josh Hall. —Charna Flam, People.com, 2 May 2025

His partner Rihanna, who isn’t exactly associated with business attire, also showed up in a trenchcoat one day. —Rosemary Feitelberg, Footwear News, 1 May 2025

Rhymes for one day

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