back-to-back
UK: ˌbæk tə ˈbæk | US: ˌbæk tə ˈbæk
adj. 1. (of events) occurring consecutively without interruption.
adj. 2. (of objects or people) positioned with backs touching or facing opposite directions.
adv. 3. in consecutive succession; one after another.
The phrase "back-to-back" originated in the 19th century, combining the word "back" (from Old English bæc, meaning "rear") with the preposition "to" to denote physical or temporal adjacency. It originally described objects (e.g., houses) built in direct contact, later extending to sequential events. The repetition of "back" emphasizes direct opposition or uninterrupted continuity.
The team won two championships back-to-back.
The chairs were placed back-to-back for the game.
She worked three shifts back-to-back without rest.
The duplex had back-to-back fireplaces.
The singer performed back-to-back concerts in the same venue.