Say something quietly
To speak very quietly to someone so that other people cannot hear you
She whispered to me that she was scared.
To say something in a soft and quiet voice that is difficult to hear clearly or understand
My daughter murmured in my ear.
To speak in a quiet voice that is difficult to hear, especially because you are annoyed about something, you do not want people to hear you, or you are talking to yourself
He just stood there muttering to himself.
To say something quietly in an unclear way so that other people cannot understand you SW: mutter
My son mumbled something about not wanting to go to school.