Simple past tense and past participle of unleash.(verb)
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Use "unleashed" in a sentence
"The name unleashed a sudden flood of memories that left him weak with the pain of their return."
"The only thing "fueling" the "death panel" myths is the twit McCain unleashed upon this nation when he selected one of the most unqualified and divisive politicians in the world to be his running mate last year."
"The fact that John McCain unleashed this beast on the entire country makes it very clear that he is no better at this point."