prolong

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
    

• 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
    

Related words

• Synonyms: 
  sustain , keep up , protract , extend , draw out