When it comes to identifying synonyms for the phrase "packing in," there are numerous options available. Some commonly used alternatives to "packing in" include "quitting," "giving up," "throwing in the towel," "calling it quits," "abandoning," "relinquishing," "surrendering," "withdrawing," "retiring," and "ceasing." All of these phrases suggest a sense of surrender or resignation, indicating that something has been abandoned or given up on. Depending on the context in which "packing in" is used, any of these phrases may be suitable alternatives to convey the same meaning. By using synonyms, writers can add variety and nuance to their language, making their writing more interesting and engaging.