(idiomatic, chiefly US) The source of an education consisting of real-world experiences, especially adverse experiences.

A theoretical model for governance, common in democratic states, which features the division of sovereign power into at least three (but sometimes up to six) organs of state in order to forestall tyranny, by preventing the acquisition of a monopoly of power by a monarch or oligarchy; also, such an arrangement.

(usually capitalized) Collection of the worst, most hated, or poorest-quality entries in a particular subject, medium, field, etc.

(uncountable) A children's game in which one player stands on top of a hill or other location atop an incline, and attempts to repel other players whose goal is to capture his position.

(idiomatic) a kind, compassionate, or caring attitude; kindheartedness.

(historical) An unrecognized nation existing from 1861-1865, consisting of the eleven Southern states who sought independence from the United States of America over the issue of slavery.

(usually capitalized, often sports) A structure housing memorials to famous or illustrious individuals (especially ones of importance to some field), often containing a collection of memorabilia relating to them.

(idiomatic, informal) No harm to one.

To accompany someone to a point of departure; to ensure someone departs safely. / (Britain) To defeat; to get rid of.

By using (an object or an approach).