How to say "back-to-back" in Japanese

• 背中合わせせなかあわせ
  nounThe literal, physical sense: two people or things with their backs touching, each facing in opposite directions, as when sitting back-to-back. Figurative uses like back-to-back meetings call for a different word.
• 続けざまつづけざま
  na-adjective, no-adjectiveThe temporal sense: events happening one after another with no pause, as in back-to-back meetings, games, or phone calls. It describes the succession itself, not any physical arrangement.
  彼かれは続つづけざまに五ご時間じかん以上いじょう働はたらかされた。↗

  He was forced to work more than five hours on end.
• アベックCommon
  prenominal modifierPaired achievements or occurrences, especially in sports: back-to-back home runs, a dual victory, a tandem flight. For an ordinary run of consecutive events, this is not the word.

Choose 「背中合わせ」 for the literal posture of two people or things back to back and facing apart, 「続けざま」 for events occurring one after another, and 「アベック」 for paired achievements like back-to-back home runs.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 背中合わせせなかあわせback-to-back
• 続けざまつづけざまsuccessive
• アベックback-to-back (e.g. home runs)
• 折り返しおりかえしback-to-back