Burble (verb)

1. To make a low, bubbling sound.
2. To talk or speak in a gentle, continuous manner.

Origin:

From middle english burlen, from old english byrgan meaning "to make a low, continuous sound".

Examples:

1. The stream burbled merrily as it flowed over the rocks.
2. The baby burbled in its sleep, making soft cooing noises.
3. The old man sat by the fire and burbled on about his youth.
4. The water in the pool burbled as the children splashed and played.
5. She sat and listened to the burbling of the fountain and felt her stress melt away.