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prolong

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prolong/prəˈlɑːŋ/verb
prolongsprolongedprolonging
prolong
/prəˈlɑːŋ/
verb
prolongsprolongedprolonging
Learner's definition of PROLONG  
[+ object]
: to make (something) last or continue for a longer time

— prolongation

/proʊˌlɑːŋˈgeɪʃən/noun,pluralprolongations[count, noncount]
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