Simple past tense and past participle of quaver.(verb)
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Use "quavered" in a sentence
"Half-way across the glade he stopped short and whirled, catlike, facing back the way he had come, as a long-drawn call quavered out across the forest."
"Halfway across the glade he stopped short and whirled, catlike, facing back the way he had come, as a long-drawn call quavered out across the forest."
"There was a silence, then an elderly woman quavered, “I am.”"