The term 'OUTER COVER' can be broken down into two crossword solutions: PEEL (4 letters) and CASING (6 letters). PEEL is a verb that means to remove the outer layer of something, such as the skin of a fruit or vegetable. CASING is a noun that refers to a protective covering, usually made of metal or plastic, that encloses an object or structure. Together, these two words describe the act of removing the outer layer of a structure or object in order to reveal what is inside.