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

Derived forms: prolonged, prolonging, prolongs

See also: prolongation

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

Encyclopedia: Prolong

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