Related Clues:

• Didn't merely grow
• Howled with laughter
• Laughed loudly
• Resounded
• Bellowed
• Grew rapidly
• Did well, as the economy
• Was prosperous
• Laughed heartily
• Made a loud sound
• Sounded like a lion
• Increased significantly, as the economy
• Expressed approval, perhaps
• Sounded like thunder
• More than tittered