(idiomatic, of a work submitted for publication) Unsolicited.

Someone who acts as a host at a formal event. / Someone who conducts a programme of varied entertainment, for example by introducing performers to the audience. / (rap music) A rapper.

(idiomatic) Bold; beyond normal, expected, or reasonable limits; outrageous. / (communication) Delivered across the Internet to a television or similar device.

(not comparable, from World War I) Over the parapet of a trench, especially at the start of a futile attack. / Used other than figuratively or idiomatically: see over, the, top.

Alternative form of one-upmanship

(mail) For distribution by (the named intermediary).

Used other than figuratively or idiomatically: see hold, one's, breath. To keep air in one's lungs, pausing noticeably before exhaling after previously inhaling.

(idiomatic) Askew, disturbed; not adjusted or working properly; out of order.

A set of guidelines and regulations to be followed by members of some profession, trade, occupation, organization etc.; does not normally have the force of law.

(idiomatic, slang) To engage in anal sex.