Bundling off is a phrasal verb that refers to the act of hurriedly sending someone away, often without giving them a chance to prepare or say goodbye properly. The opposite of bundling off would be a careful and considerate departure, where the person is given time to gather their belongings, say goodbye to loved ones, and leave in a respectful and dignified manner. Other antonyms for bundling off could include taking time, lingering, or delaying, as these all suggest a slower and more thoughtful approach to leaving. Ultimately, the choice of antonym will depend on the specific context and the desired tone and meaning of the message being conveyed.