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Definition of prolong verb from the Oxford Advanced American Dictionary

 

prolong

 verb
verb
NAmE//prəˈlɔŋ//
 
prolong somethingVerb Forms present simple I / you / we / they prolong
 
,
 
he / she / it prolongs
 
,
 
past simple prolonged
 
,
 
-ing form prolonging
 
,
 
 
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to make something last longer synonym extend The operation could prolong his life by two or three years. Don't prolong the agony (= of not knowing something) —just tell us who won!
See prolong in the Oxford Advanced Learner's Dictionary
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