definition of
prolong

[1] #1 prolong v. [protract, extend, draw out] 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". wn

[2] #2 prolong v. [sustain, keep up] 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". wn