Source : WordNet®

keep on
     v : allow to remain in a place or position; "We cannot continue
         several servants any longer"; "She retains a lawyer";
         "The family's fortune waned and they could not keep their
         household staff"; "Our grant has run out and we cannot
         keep you on"; "We kept the work going as long as we
         could" [syn: {retain}, {continue}, {keep}, {keep going}]