More muttering going on than I had imagined! Apparently this one is nearly the four thousandth most common word in the Project Gutenberg corpus.

• 2.031 and Thorin muttered something about supper,
• 2.036 and muttering,
• 5.033 Mouthless mutters.
• 7.083 and muttered:
• 8.068 he muttered,
• 8.126 he kept on muttering
• 9.033 they muttered.
• 10.012 where they sat or lay muttering
• 15.034 and they muttered
• 17.035 muttering