A chattering or chirping sound; a commotion or noise made by many creatures or voices together.
From Old English and Germanic roots, related to 'chirp' and similar sound-imitative words. The term originally referred to the combined noise of birds or crowds.
Medieval manuscripts used 'chirm' to describe the deafening noise of bird colonies—it's essentially the Old English word for what we'd now call 'cacophony,' and shows how people have always struggled to describe overwhelming soundscapes.
Complete word intelligence in one call. Free tier — 50 lookups/day.