The term UNATTACH can be solved in a crossword puzzle with the answer FREE, which is a four-letter word. Unattach means to separate or disconnect something from something else, usually permanently. It is often used in reference to technology, such as when a file is unattached from an email or when a device is unplugged from a power source. Unattaching can also refer to the removal of an attachment from a piece of clothing or furniture.