keep up

verb

1. maintain a required pace or level

   verb.competition

   Examples

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

   Source: WordNet 3.0

2. lengthen or extend in duration or space

   verb.stative

   Examples

   Keep up the good work.

   Synonyms prolong sustain

   Source: WordNet 3.0

3. keep in safety and protect from harm, decay, loss, or destruction

   verb.possession

   Examples

   The old lady could not keep up the building.

   Synonyms conserve maintain preserve

   Source: WordNet 3.0

4. keep informed

   verb.change

   Synonyms follow keep abreast

   Source: WordNet 3.0

5. prevent from going to bed at night

   verb.body

   Source: WordNet 3.0