There are numerous synonyms for the phrase "bid someone goodbye/good evening etc." that can add variety and uniqueness to your conversations. Some of the synonyms for saying goodbye include "farewell," "see you later," "take care," and "goodbye for now." If you want to bid someone a good evening, you can say "have a pleasant evening," "enjoy your evening," or "have a great night." For a formal farewell, you can use "adieu," "cheerio," or "au revoir." Whether you go for a casual or formal tone, selecting the right synonym can help to leave a lasting impression on the person you are speaking to.