The term PIN, SAY can be solved by two crossword solutions: ATTACH (6 letters) and AFFIX (5 letters). Both terms refer to the act of attaching or affixing something to another object. ATTACH is a more general term that can refer to any kind of attachment, while AFFIX is more specific and usually refers to attaching something with glue or adhesive. Both terms are commonly used in everyday language, and are often used when talking about attaching documents or objects to other objects.