Simple past tense and past participle of yammer.(verb)
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Use "yammered" in a sentence
"I only "yammered" about the harmfull effect of drugs to refute the people who claim there are none."
""I only" yammered "about the harmfull effect of drugs to refute the people who claim there are none."
"Red One - a week of torture, living, the details of which she yammered out from her face in the mire until he realized that he was yet a tyro in knowledge of the frightfulness the human was capable of wreaking on the human."