interjection/k‿a s(ə).la nə tjɛn/
no matter! no big deal! so be it! fair enough! never mind that!
“« Qu'à cela ne tienne, dit Peronella, mon mari va s'y mettre à son tour, afin de le bien nettoyer. »” — "Nevermind that," said Peronella, "my husband is going to start on it in turn, to thoroughly clean it."
Synonyms: ça ne fait rien
Literally, “let it not depend on that”, or more loosely translated as “let that make no difference”.