Sough is a sound made by air passing through a narrow opening, such as a vent or pipe. It is often used to describe the sound of wind blowing through trees or other vegetation. The term can also be used to describe a low, continuous sound, such as a MURMUR or MOAN. The crossword solutions for the term sough are SIGH (4 letters), MURMUR (6 letters), and MOAN (4 letters). SIGH is an expression of emotion, usually sadness or relief, that is made with a deep breath. MURMUR is a low, continuous sound, often made by a group of people. MOAN is a low, mournful sound, usually expressing pain or sorrow.