The spine and associated tissues. / (slang, uncountable) Large and attractive buttocks. / (figuratively) The part of a piece of clothing which covers the back.

At or near the rear. / (predicative) Returned or restored to a previous place or condition. / Not current. / Situated away from the main or most frequented areas. / In arrears; overdue.

Before now; ago.

(intransitive) To go in the reverse direction. / (transitive) To support.

A large shallow vat; a cistern, tub, or trough, used by brewers, distillers, dyers, picklers, gluemakers, and others, for mixing or cooling wort, holding water, hot glue, etc. / A ferryboat.

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

(idiomatic) sequential or consecutive, in the case of exactly three events.

Alternative form of back to back

Alternative form of back-to-back

sequential or consecutive. / With one's back facing that of somebody else. / (physics, by extension) emerging in exactly opposite directions / (of a house) Having a party wall at the rear