Definition of pin on

The phrase "pin on" originally referred to the practice of affixing badges or insignia to clothing using safety pins or similar fasteners. These badges, known as rank insignia, are used to indicate an individual's rank or position within an organization, such as the military or a volunteer group. The expression "pin on" was first used in military contexts to describe the process of attaching these badges to uniforms, as they would be "pinned on" to the appropriate location on the coat or shirt. Over time, "pin on" has taken on a metaphorical meaning in other contexts, such as in the phrase "pin on a medal," which is used to describe the act of presenting someone with a decoration or honor. In modern usage, "pin on" is still commonly used to describe the process of attaching badges and other decorations, but it has also come to be used more broadly to refer to any assignment or delegation of responsibility or authority. In business settings, for example, a manager might say, "I'm going to pin that project on you," meaning that they are assigning the project to the employee. Overall, the phrase "pin on" has a rich history and remains a common and versatile expression in modern English.