A one-night stand
An activity lasting only one night.The band played one-night stands in many small towns.
One little bit
Any at all, at all (usually used in the negative).I do not agree with my supervisor one little bit about the new schedule.
One jump ahead of (someone or something)
Better prepared or more successful than someone or something else, expecting and prepared for what will happen.The little boy was one jump ahead... Read more →
One in a thousand/hundred/million
Unique, one of a very few.I only had a one in a million chance of finding my ring which I dropped into the lake.
One for the (record) books
Something very unusual or remarkable.The latest complaint about noise at work is one for the books and is very stupid.
The one for (someone)
The right partner, the right person to marry.When I introduced my girlfriend to my mother she said that she was the one for me.
One foot in the grave
Near death.The woman has one foot in the grave and is not expected to live much longer.
One by one
One at a time, each in turn.One by one the singers walked onto the stage.
One-armed bandit
A slot machine for gambling.My friend spent the weekend with a one-armed bandit and now he has no money.
One and the same
The very same thing, the very same person.It is one and the same if we finish the job today or continue until tomorrow.