plural of running back

(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.

(hunting) An act of hounds retracing a course in order to pick up the lost scent of prey.

plural of back-up

plural of back door

(transitive) To pay a debt, to provide the entire amount of money owed to another. / (figuratively) To avenge, to exact revenge.

The smaller of two channels in a river that diverge to form an island. / A secondary channel of activity, typically in parallel with primary channels and somewhat independent of them.