Simple past tense and past participle of boomerang.(verb)
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Use "boomeranged" in a sentence
"Bloomberg's criticism of Robert Morgenthau's hidden bank accounts have "boomeranged," and now the mayor is coming under fire from Bill Thompson and John Liu."
"Part 2: They may have 'boomeranged' or 'failed to launch', but don't call them dysfunctional"
"They may have 'boomeranged' or 'failed to launch', but don't call them dysfunctional"