adverb
alternately; by turns; in turn
Describes two or more people doing something one after another in a repeated cycle. Often used in casual, everyday contexts.
子どもたちが代わりばんこにブランコに乗っている。
The children are taking turns on the swing.
姉と代わりばんこに皿を洗った。
I washed the dishes in turns with my older sister.
More formal and orderly; implies a fixed sequence. 代わりばんこに is more casual and emphasizes swapping or alternating.
Also means alternately, but often used for two things or people alternating in a regular pattern. 代わりばんこに can be used for more than two and feels more colloquial.
Derived from 代わり (substitute) + 番 (turn) + こ (diminutive suffix) + に (adverbial particle). The exact historical development is uncertain, but it likely originated in colloquial speech.