(literally) To move backwards away from something. / (idiomatic) To become less aggressive, particularly when one had appeared committed to act. / (idiomatic) To lower the setting of.

(idiomatic) To reply impertinently; to talk back. / To reply to a question at a later time. / (computing) To issue echo characters, protocol responses, reflexive connection requests, etc.

(film) A cinematic technique in which live action is filmed in front of a screen on which the background action or a background scene is projected. / tomographic reconstruction

(athletics, horse racing) The straight part of a racetrack, running track, etc., opposite the finishing line; the backstretch.

(temporal location, idiomatic, informal) In the distant past; especially, at a time fondly remembered.

(cricket, of a batsman) Having the weight on the back foot in order to play a defensive stroke / (idiomatic) in a defensive posture; on the defensive; off balance; at a disadvantage.

A bad back, or that illness, humorously supposed to arise from excessive sexual intercourse.

(Tyneside) Alternative form of woollyback (“pejorative: an inhabitant of a rural area”). / (Scotland, derogatory) A term of abuse directed at Highlanders or rural folk in general.

A small, controlled fire set in the path of a larger uncontrolled fire, in order to limit the spread of the large fire by removing its fuel.

plural of wooley back.