Simple past tense and past participle of peter.(verb)
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Use "petered" in a sentence
"This one-liner vehicle driven by William Shatner and based on a Twitter feed of the same name petered out in one season; the original feed forges on with about 3 million followers."
"Steve Forbes tried to do some of that but his candidacy for the Iowa caucuses kind of petered out real quickly so it never went anywhere."
"About a dozen years ago, a discussion began about a subject that was important but kind of petered out without a resolution."