1. (

• prolong ,
• 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" ;

2. (

• prolong ,
• 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" ;