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Use "grumbling" in a sentence
"Usually the grumbling is a ploy to keep signing costs down."
"My co-host HoneyB of The Life and Loves of Grumpy's Honeybunch was finally able to make her treasured Mom's Scrambled Tofu (it's my understanding there may have been some grumbling from the meat and potatoes Grumpy)."
"Judging the quantity of grumbling is always a fairly subjective process."