The term 'LOCKS IN A STABLE' can be broken down into two crossword solutions: MANE (4 letters) and MANES (5 letters). A MANE is the long, thick hair that grows on the neck of a horse or other equine animal. It is usually darker than the rest of the coat and is often seen as a sign of health and vigor. Manes are also used to help protect the horse from biting insects and other predators. Manes can be groomed and styled in various ways, depending on the breed and purpose of the horse. Manes are also sometimes braided or plaited for show purposes. The plural form of MANE is manes.