(UK) A traditional house with one room upstairs and one room downstairs.

plural of one-up-one-down

Each individual should act for the benefit of the group, and the group should act for the benefit of each individual.

Alternative form of it takes one to know one

(idiomatic) A state of dread.

(idiomatic, vulgar, informal) In a state of being unprepared, powerless, or idle.

(idiomatic) astonished, amazed

(idiomatic) To outdo somebody; to surpass someone or something.

Synonym of BOGO

Synonym of one's heart in one's mouth