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Definition of flak jacket noun from the Oxford Advanced Learner's Dictionary

flak jacket

noun
 
/ˈflæk dʒækɪt/
 
/ˈflæk dʒækɪt/
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  1. a heavy jacket without arms that has metal or other special material inside it to make it stronger, and is worn for example by soldiers and police officers to protect them from bullets, shells, etc.
See flak jacket in the Oxford Advanced American Dictionary
biodegradable
adjective
 
 
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The environment
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