plural of back-to-back

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

(not comparable) To or in a previous condition or place. / In a direction opposite to that in which someone or something is facing or normally pointing.

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.

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 surname. / A hamlet in St Clears community, Carmarthenshire, Wales (OS grid ref SN2515). / A locality in Jämtland, Sweden.

simple past tense and past participle of back

(obsolete, slang) Put on one's back; killed; rendered dead. / (in combination) Having specified type of back. / (in combination) Having specified type of backing.