(idiomatic) Unique, one of a kind.

(idiomatic) Only love, sole sweetheart.

plural of hole in one

Having only one hand. / Performed using only one hand. / Designed for use with one hand / (specifically, of reading or reading material) Pornographic in nature. / That uses one hand.

Using only one hand; one-handedly. / (figuratively) Very easily, without effort.

simple past tense and past participle of one-up

(slang) obsession with a particular person who is idealized as the only right one to date or to marry, often without any actual relationship developments.

That keeps promises and tells the truth.

(idiomatic) extremely desperately

(slang, intransitive) To break wind.