Girthing is a term that refers to the measurement of the girth of a horse or other animal. Antonyms for this word, which mean the opposite or something completely different, might include terms like "ungirt" or "ungirded," meaning that the girth has been removed or undone. Other antonyms for girthing could include terms related to different kinds of measurements, such as "height," "length," or "width." Alternatively, antonyms could include words that are completely unrelated to measurements, such as "colorful," "delicious," or "awesome." When looking for antonyms for girthing, it is important to consider the meaning of the word and the context in which it is being used.