The term 'cloud over' can be described by four crossword solutions: MIST (4 letters), BEFOG (5 letters), DARKEN (6 letters), and SHADE (5 letters). MIST is a thin fog or cloud that is close to the ground, while BEFOG is to make something unclear or confused. DARKEN is to make something darker, and SHADE is to provide partial protection from the sun. All of these words describe the phenomenon of a cloud covering the sky, blocking out the sun and creating a darker atmosphere.