The phrase "kiss goodbye" typically refers to saying farewell or parting with someone, often with a kiss on the cheek or lips. Some antonyms for this phrase could include "greeting warmly," "embracing," or "welcoming back." These alternatives suggest a positive and affectionate exchange, rather than a final farewell. Other antonyms might include "staying together," "never leaving," or "continuing the relationship," indicating a desire to maintain a close connection. Ultimately, the choice of antonym depends on the context and the speaker's intentions, but these alternatives offer a range of possibilities for expressing a different sentiment than "kiss goodbye.