Slogan for the reunification of China as one country, but with areas like Hong Kong and Taiwan with separate economic and political systems.

(computing, informal) The rule that a database, a user interface, etc. should allow for either zero, one, or an indefinite number of an entity.

(informal, sarcastic) It is highly doubtful: indicating that something is not likely to happen to the person specified.

(idiomatic) To be grateful, feel oneself fortunate.

(idiomatic) Of a person: having the same disposition, feelings, or opinions as oneself. / (idiomatic) Of a situation or thing: according to, or appealing to, one's own desire, liking, or taste.

(idiomatic) To pilot an aircraft without the aid of instruments and without a flight plan, using only instinct, visual observation, and practical judgment.

(idiomatic) To announce one's candidacy in a contest

To keep one's own business private; to be discreet, careful, or circumspect in what one says concerning one's own thoughts, deeds, or situation.

(idiomatic) To keep a secret; to refrain from speaking indiscreetly or carelessly; broadly, to refrain from speaking altogether.

(idiomatic) To act in one's own interests; to act in a manner advantageous primarily to oneself.