English: Goodbye
French: Au revoir
Spanish: Adiós
Russian: До свидания (Do svidaniya)
Chinese (Mandarin): 再见 (Zàijiàn)
Arabic: وداعا (Wada'an)
German: Auf Wiedersehen
Japanese: さようなら (Sayōnara)
Portuguese: Adeus
Korean: 안녕히 가세요 (Annyeonghi Gaseyo)
Hindi: अलविदा (Alvida)
Note:
* The Chinese phrase "再见" (Zàijiàn) is used for both farewell and goodbye.
* "До свидания" (Do svidaniya) in Russian is a more formal way of saying goodbye, while "Пока" (Poka) is a more casual way to say goodbye.
* The word "Adeus" in Portuguese is often used in more formal situations, while "Tchau" is a more informal way of saying goodbye.
* In Korean, "안녕히 계세요" (Annyeonghi Gyeseyo) is also a common way to say goodbye, but it's used when the person saying goodbye is staying, while the other person is leaving.
* "Alvida" in Hindi is a more formal way of saying goodbye. "Khuda Hafiz" is another way to say goodbye, often used among Muslims.
Remember that the specific context and level of formality will influence which phrase is most appropriate in each situation.