Verb keep on has 1 sense
  1. retain, continue, keep, keep on, keep going - 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"
    --1 is one way to prolong, sustain, keep up
    Sample sentences:
    Somebody ----s somebody
    Something ----s somebody
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