Third-person singular simple present indicative form of back

(Canada, US) behind

(idiomatic) On or for a round trip journey, literal or figurative.

To reverse a vehicle into a space. / (idiomatic) A betting term from French hazard

In the past time of.

A surname.

behind; to or toward the rear / previously; in the past; ago

(travel, UK, Ireland) Any of a series of airline tickets, issued with overlapping travel dates, used to circumvent airfare minimum stay requirements.

(baseball) Two home runs hit by consecutive batters

(telecommunications) The direct connection of the output of one telecommunications device to the input of another.