mutter
A. -noun murmullo (m)
·a mutter of voices
·un murmullo de voces
B. -transitive verb murmurar, decir entre dientes
·"yes," he muttered
·--nouní --dijo entre dientes
C. -intransitive verb
(generally) murmurar
[guns, thunder] retumbar a lo lejos
(=complain) quejarse