Definition of redouble verb from the Oxford Advanced American Dictionary

 

redouble

 verb
verb
NAmE//ˌriˈdʌbl//
 
redouble somethingVerb Forms present simple I / you / we / they redouble
 
he / she / it redoubles
 
past simple redoubled
 
-ing form redoubling
 
 
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to increase something or make it stronger The townspeople are redoubling their efforts to find the missing child. redoubled enthusiasm Their doubts were redoubled by this news.
See the Oxford Advanced Learner's Dictionary entry: redouble