A cry rises from the center of the crowd, and a whoop. The Dauntless cheer at varying pitches, high and low, bright and deep. Their roar mimics the roar of the water

What does bright and deep mean here?

Question

A cry rises from the center of the crowd, and a whoop. The Dauntless cheer at varying pitches, high and low, bright and deep. Their roar mimics the roar of the water

What does bright and deep mean here?

Answer

"Bright" means a high-pitched sound, and "deep" means a low-pitched sound.