mutter to (oneself)

Translations
бормотать себе
He often mutters to himself when he is thinking.
Он часто бормочет себе под нос, когда думает.
Definitions
To speak quietly or indistinctly to oneself, often in a way that expresses dissatisfaction, annoyance, or contemplation.
Words
mutter

verb
бормотать
to

preposition
себе
oneself

pronoun
самому себе