(idiomatic) To disclose a secret; to let a secret be known, often inadvertently.

The slow westward shift of the equinoxes along the plane of the ecliptic, resulting from precession of the earth's axis of rotation, and causing the equinoxes to occur earlier each year

(idiomatic, disapproving) to appear or emerge unexpectedly or inexplicably, frequently in large numbers or quantity.

Within the letter of the law but not the spirit of the law.

(rare) A man, chiefly a homosexual, who has anal sex.

(Britain) The sergeant-at-arms in the House of Lords.

(nautical, military) A large square-rigged warship large enough to have a place in the line of battle, with up to 140 guns on at least two decks. A capital ship from the age of sail, superior to a frigate; usually, a seventy-four, or three-decker.

(idiomatic) Approximate, rough, simplified, especially of a calculation, estimation or other reasoning.

(idiomatic) (It's of) minor importance, at least not as important as it first seemed.

(idiomatic) The greatest part of anything; the finest and most abundant share of resources; the cream of the crop.