Of course, you can say "adjust" or "I adjust" as well, but "J'adoube" is recognized worldwide as the same thing—this distinction could be important if you play against someone who doesn't speak your language in an OTB game. 2025 September 22 (last accessed), “J'adoube - Chess Terms”, in Chess.com, archived from the original on 30 Jul 2025:
(abbreviation, alt-of, initialism, not-comparable) Initialism of on the button.