Related Clues:

• Leo sound
• Crowd din
• Sound of an angry mob
• Elementary learning technique
• It starts most MGM films
• Not just laugh
• Blast furnace sound
• Lion sound
• Niagara noise
• School drills, say
• Leo's pronouncement
• From memory (with ''by'')
• Beastly noise
• Shea din
• Die laughing, so to speak