Simple past tense and past participle of torpedo.(verb)
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Use "torpedoed" in a sentence
"Einer had been able to catch the word torpedoed, and the latitude and longitude where a ship had apparently gone down."
"McCain torpedoed any vestige of credibility he had when he knowingly considered putting know-nothing Palin a heartbeat away from the Presidency."
"He adamantly refused to discuss the issue of Jerusalem prior to the Camp David summit, claiming that to do so would have "torpedoed" the prospects for success."