English to English

verb (v)

• maintain a required pace or level(verb.competition)

  Example:
  He could not keep up and dropped out of the race.
  

  source: wordnet30
• lengthen or extend in duration or space(verb.stative)

  Example:
  Keep up the good work.
  

  Synonym:
  prolong, sustain
  

  source: wordnet30
• keep in safety and protect from harm, decay, loss, or destruction(verb.possession)

  Example:
  The old lady could not keep up the building.
  

  Synonym:
  conserve, maintain, preserve
  

  source: wordnet30
• keep informed(verb.change)

  Synonym:
  follow, keep abreast
  

  source: wordnet30
• prevent from going to bed at night(verb.body)

  source: wordnet30