I have been often intrigued by the phrase "back-to-back". Referring to "back" is reminiscent of the rear of the human body.
I usually hear-
- back-to-back meetings
English Language & Usage Stack Exchange is a question and answer site for linguists, etymologists, and serious English language enthusiasts. It only takes a minute to sign up.Sign up to join this community
I see and use the phrase often as an American, and this cursory search of a UK news source shows it's common there too:
It's common in both dialects and I've never thought of it as anatomical.