Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Mutter
Muttering like the murmur of hurried priest dispatching a prayer.
—Victor Hugo
Mutter like sullen bulls.
—Charles Kingsley
He sits muttering in his beard. His voice
Is like a river flowing underground.
—Henry W. Longfellow
Muttering like smoked bees.
—Algernon Charles Swinburne
Mutters like a dim despair.
—Frank Waters