PROLONG
prolong, protract, extend, draw out
(verb) lengthen in time; cause to be or last longer; “We prolonged our stay”; “She extended her visit by another day”; “The meeting was drawn out until midnight”
prolong, sustain, keep up
(verb) lengthen or extend in duration or space; “We sustained the diplomatic negotiations as long as possible”; “prolong the treatment of the patient”; “keep up the good work”
Source: WordNet® 3.1
Etymology
Verb
prolong (third-person singular simple present prolongs, present participle prolonging, simple past and past participle prolonged)
(transitive) To extend in space or length.
(transitive) To lengthen in time; to extend the duration of
Synonym: draw out
(transitive) To put off to a distant time; to postpone.
(intransitive) To become longer; lengthen.
Source: Wiktionary
Pro*long", v. t. [imp. & p. p. Prolonged; p. pr. & vb. n.
Prolonging.] Etym: [F. prolonger, L. prolongare; pro before, forth +
longus long. See Long, a., and cf. Prolongate, Purloin. ]
1. To extend in space or length; as, to prolong a line.
2. To lengthen in time; to extend the duration of; to draw out; to
continue; as, to prolong one's days.
Prolong awhile the traitor's life. Shak.
The unhappy queen with talk prolonged the night. Dryden.
3. To put off to a distant time; to postpone. Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition