Definitions from Wiktionary (back-to-back)

▸ adjective:  Sequential or consecutive.
▸ adjective:  With one's back facing that of somebody else.
▸ adjective:  (physics, by extension) Emerging in exactly opposite directions.
▸ adjective:  (of a house) Having a party wall at the rear.
▸ adjective:  (poker slang) Synonym of wired (“being a pair in seven card stud with one face up and one face down”).
▸ noun:  A house with a party wall at the rear.
▸ noun:  (oil industry) One of a pair of rig workers who are rostered on alternately.
▸ adverb:  Alternative form of back to back [With one's back facing that of somebody else.]
▸ Also see back-to-back

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