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Adjective: prolonged  pru'longd [N. Amer], pru'lóngd [Brit]
  1. Relatively long in duration; tediously protracted
    "a prolonged and bitter struggle";
    - drawn-out, extended, lengthy, protracted, long-drawn-out
  2. Drawn out or made longer spatially
    "a prolonged black line across the page";
    - elongated, extended, lengthened
Verb: prolong  pru'long [N. Amer], pru'lóng [Brit]
  1. Lengthen in time; cause to be or last longer
    "We prolonged our stay";
    - protract, extend, draw out
  2. Lengthen or extend in duration or space
    "prolong the treatment of the patient";
    - sustain, keep up

See also: long

Type of: bear on, carry on, continue, lengthen, preserve, uphold