Meaning : Maintain a required pace or level.
He could not keep up and dropped out of the race.
Meaning : 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.
Meaning : 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.