Related Clues:

• Blow off steam
• Boo
• Serpentine sound
• Sibilant sound
• Snake's sound
• Unwarm welcome
• ''You stink!''
• Be sullen
• [Man, this is heavy!]
• Mournful cry
• Ghostly greeting
• It'll give you a start
• Word from 22-Down?
• Derisive cry
• Wear a puss