Definition of “prolong” - English Dictionary

“prolong” in British English

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prolongverb [ T ]

uk /prəˈlɒŋ/ us /prəˈlɑːŋ/
prolongation
noun [ U ] uk /ˌprəʊ.lɒŋˈɡeɪ.ʃən/ us /ˌproʊ.lɑːŋˈɡeɪ.ʃən/

(Definition of “prolong” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“prolong” in American English

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prolongverb [ T ]

us /prəˈlɔŋ/

to make something last a longer time:

They’re trying to prolong their lives.
prolonged
adjective us /prəˈlɔŋd/

Grasslands were damaged by the prolonged drought.

(Definition of “prolong” from the Cambridge Academic Content Dictionary © Cambridge University Press)