The term "sur-mount" refers to overcoming or surpassing a challenge, obstacle or difficulty. Some antonyms for the word include "fail," "fall short," "lose," "yield," "surrender," and "give up." When one sur-mounts something, they may also be described as "triumphant," "victorious," or "successful," while the opposite of these would be antonyms for sur-mount. It is important to keep in mind that antonyms are not always exact opposites, and the context of the sentence plays a crucial role in determining the antonym. Antonyms are essential in improving vocabulary and understanding of language, as they provide alternative ways of expressing thoughts and ideas.