The word "un-bolts" means to remove a bolt or locking mechanism from something. Its antonyms are words that convey the opposite meaning of "un-bolts." The antonyms of "un-bolts" include fastens, secures, locks, and tightens. Fastening refers to the process of joining two or more objects together securely. Securing signifies making something stable, firm, or tight. Locking involves using a key, combination, or other mechanism to prevent access to something. Tightening means making something more secure, fixed, or stable. These antonyms provide a better understanding of the context in which "un-bolts" is used and help to identify the intended meaning of a sentence.