In Dinka, you can say goodbye by saying "Kuŋ acin."
In Tigrinya, you can say goodbye by saying "ዋላ" which is pronounced as "wala."
In Chipewyan, you can say goodbye by saying "tansi" or "ho jan."
In Gambian, you can say goodbye by saying "sa dauda," which means farewell.
In the Torres Strait language, you can say goodbye by saying "Kilei."
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In Algerian Berber, you can say goodbye by saying "ẓẓsen tmurt" which translates to "stay well" or "goodbye."
To say goodbye, you rub your hands under your armpits and wipe it on the person's cheeks that your saying goodbye to.
In Choctaw, you can say goodbye by saying "Chi pisa la chike."
depends on when you're saying goodbye. for when you're saying goodbye for a short time you say; Hágooshį́į́ (hago shi). for when you're saying goodbye for a long time you say; Hágoóne' (hago a na).
In Gujarati, you can say goodbye by saying "આવજો" (Aavjo) or "આવજી" (Aavji) which both translate to "goodbye" in English.
The best way to say goodbye is to give someone a smile, embrace and hug him and tell him nice things.