Pin on Definition 1 of 3Pro Tip 1/3Physical Attachment Used when actually attaching items with a pin; often involves clothing or a surface. He pinned his name tag on his coat. Pro Tip 2/3Temporary Affixing Indicates a non-permanent action, you can later remove whatever's pinned. She pinned the note on the board in case anyone came looking for her. Pro Tip 3/3Visible Placement Used when you want the pinned item to be seen, like badges or decorations. They pinned ribbons on the winners' shirts.