prolong

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pro·long / prəˈlông; -ˈläng/ (also pro·lon·gate / -ˈlônggāt; -ˈläng-/ ) • v. [tr.] extend the duration of: an idea that prolonged the life of the engine by many years. ∎  (usu. be prolonged) rare extend in spatial length: the line of his lips was prolonged in a short red scar.DERIVATIVES: pro·lon·ga·tion / prōˌlôngˈgāshən; prə-/ n.pro·long·er n.