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

(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.

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.

Used other than figuratively or idiomatically: see back, into. / (sports, idiomatic) To advance to the post-season as a result of another team's loss, especially where one's own team has also lost.

Support, especially financial. / A liner or other material added behind or underneath. / (television, film) A backdrop. / (music) Musicians and vocalists who support the main performer.

(music) Providing support for the main performer.

present participle of back

(Canada, US) behind