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Verb: keep up
  1. Maintain a required pace or level
    "He could not keep up and dropped out of the race"
     
  2. Lengthen or extend in duration or space
    "keep up the good work";
    - prolong, sustain
     
  3. Keep in safety and protect from harm, decay, loss, or destruction
    "The old lady could not keep up the building";
    - conserve, preserve, maintain
     
  4. Keep informed
    "He kept up on his country's foreign policies";
    - keep abreast, follow
     
  5. Prevent from going to bed at night

Derived forms: keeps up, kept up, keeping up

See also: keep

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