Related Clues:

• Repeating
• Imitating
• Bouncing off the walls
• Bouncing off the Grand Canyon walls
• Resounding
• Parrotlike behavior
• Repetition
• Bouncing off walls
• Saying again
• Reverberant
• Reverberating
• Saying likewise
• Returning safe, perhaps, but surely sound
• Going around, by the sound of it
• Coming back in waves?