prolong

Verb
  1. Lengthen in time;
    Cause to be or last longer (synset 200318689)
    "We prolonged our stay"; "She extended her visit by another day"; "The meeting was drawn out until midnight"
  2. Lengthen or extend in duration or space (synset 202685340)
    "We sustained the diplomatic negotiations as long as possible"; "prolong the treatment of the patient"; "keep up the good work"

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