1) Blew off steam 2) Companion of booed 3) Displayed displeasure 4) Exercised sibilancy 5) Gave the villain his due 6) Greeted the bad guy 7) Made a whistling sound 8) Made like an asp 9) Made sibilant sounds 10) Razzed 11) Reacted like an angry cat 12) Showed disapproval 13) Showed displeasure 14) Sounded angry 1) Booed 
• (imp. & p. p.) of Hiss