unfasten

This term describes the specific action of releasing a mechanical locking mechanism. It carries a connotation of precision and intentionality, often associated with safety equipment or formal attire. It is more technical and specific than the general word "open." Usage typically centers on items that are secured by a physical device, such as a buckle, a clasp, or a bolt. It is frequently employed in instructional contexts, such as safety briefings on airplanes or manuals for clothing and gear.