maintain a required pace or level;
"He could not keep up and dropped out of the race"
lengthen or extend in duration or space;
"We sustained the diplomatic negotiations as long as possible"
"prolong the treatment of the patient"
"keep up the good work"
keep in safety and protect from harm, decay, loss, or destruction;
"We preserve these archeological findings"
"The old lady could not keep up the building"
"children must be taught to conserve our national heritage"
"The museum curator conserved the ancient manuscripts"
"He kept up on his country's foreign policies"
prevent from going to bed at night;
"The anticipation of the trip kept the children up all night"
"I kept myself up all night studying for the exam"
- The house is becoming too expensive for them to keep up.
- The high cost of raw materials is keeping prices up.
- The enemy kept up their bombardment day and night.