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prolong (v.)

early 15c., prolongen, "lengthen in time, extend the duration of; delay, postpone," back-formation from prolongation or else from Old French prolonguer, porloignier (13c.) and directly from Late Latin prolongare "to prolong, extend," from Latin pro "forth" (see pro-) + longus "long" (adj.); see long (adj.). The same elements also form purloin. Related: Prolonged; prolonging; prolongable.

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Definitions of prolong from WordNet

prolong (v.)
lengthen in time; cause to be or last longer;
We prolonged our stay
Synonyms: protract / extend / draw out
prolong (v.)
lengthen or extend in duration or space;
prolong the treatment of the patient
Synonyms: sustain / keep up
From wordnet.princeton.edu