(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.

(soccer) An intentional pass to the goalkeeper by a teammate.

(idiomatic) To reply impertinently or rudely; to answer in a cheeky or rude manner. / (idiomatic) To return disrespect.

(idiomatic) To recover from a negative without seemingly any damage. / (of a message, usually an email) To be returned to the sender because it is undeliverable.

(hunting) Of hounds: to retrace a course in order to pick up the lost scent of prey. / (by extension) To return to where one has previously been; to retrace one's steps.