(idiomatic) An event or achievement which is unpleasant for someone, especially for those who considered it impossible or unwelcome; an annoyance.

(Britain) monkey in the middle

(idiomatic, often used attributively) The worst or lowest quality on the market, especially among a range of products.

(idiomatic) To increase a wager. / (idiomatic) To make something more desirable.

(idiomatic) To sacrifice someone, especially in an attempt to save oneself.

(transitive, idiomatic) To mismanage to the point of ruin. / (transitive, idiomatic) To wear out, especially through excessive use. / (transitive, idiomatic) To discuss ad nauseam.

(idiomatic) To attempt to prevent a problem that has already occurred.

(biology) A theory of evolution, especially the scientific theory of evolution through natural selection. / (by extension) Any model of disequilibrium or accumulating change.

(US) A building where movies are shown to an audience; a cinema.

(euphemistic) Used for emphasis after an interrogative word.