Crossword Genius

Grouse quietly (6)

Ross

I believe the answer is:

mutter

(Other definitions for mutter that I've seen before include "Low continuous sound" , "Speak or grumble in low clear voice" , "Speak indistinctly or grumble" , "Talk indistinctly in a low voice - a German mother" , "Talk under one's breath" .)

I've seen this clue in the Universal.
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