keep up keep up /ˈkiːp ʌp/

verb

1. () Maintain a required pace or level  ( keep up )
   maintain a required pace or level
    He could not keep up and dropped out of the race
   He could not keep up and dropped out of the race
   
2. () Lengthen or extend in duration or space  ( prolong , keep up , sustain )
   lengthen or extend in duration or space
    We sustained the diplomatic negotiations as long as possible
   We sustained the diplomatic negotiations as long as possible
    Prolong the treatment of the patient
   prolong the treatment of the patient
    Keep up the good work
   keep up the good work
   
3. () Keep in safety and protect from harm, decay, loss, or destruction  ( conserve , keep up , preserve , maintain )
   keep in safety and protect from harm, decay, loss, or destruction
    We preserve these archeological findings
   We preserve these archeological findings
    The old lady could not keep up the building
   The old lady could not keep up the building
    Children must be taught to conserve our national heritage
   children must be taught to conserve our national heritage
    The museum curator conserved the ancient manuscripts
   The museum curator conserved the ancient manuscripts
   
4. () Keep informed  ( follow , keep abreast , keep up )
   keep informed
    He kept up on his country's foreign policies
   He kept up on his country's foreign policies
   
5. Prevent from going to bed at night  ( keep up )
   prevent from going to bed at night
    The anticipation of the trip kept the children up all night
   The anticipation of the trip kept the children up all night
    I kept myself up all night studying for the exam
   I kept myself up all night studying for the exam