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English definition of “boomerang”

boomerang

noun [C] uk   /ˈbuː.mə.ræŋ/ us  
a curved stick that, when thrown in a particular way, comes back to the person who threw itMiscellaneous games and activitiesHand weaponsHandguns and rifles

boomerang

verb [I] uk   /ˈbuː.mə.ræŋ/ us  
If a plan boomerangs, it brings a harmful result instead of the intended good one: Our plan to take over the business could boomerang on us if we're not careful.Failing and doing badly
(Definition of boomerang from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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