(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.

(idiomatic) A list of abbreviations, separated by commas, representing the academic qualifications and civil or military honours achieved by a person

To avoid doing (something) by speaking to someone using (possibly false) logic and reasons.

To clearly show one's support for a side or opinion in a dispute, often indicating an intention to defend that side to the end.

Alternative spelling of nail one's colours to the mast