Meaning : Maintain a required pace or level.
Example :
He could not keep up and dropped out of the race.
Meaning : Keep in safety and protect from harm, decay, loss, or destruction.
Example :
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.
Synonyms : conserve, maintain, preserve
Meaning : Keep informed.
Example :
He kept up on his country's foreign policies.
Synonyms : follow, keep abreast
Meaning : Prevent from going to bed at night.
Example :
The anticipation of the trip kept the children up all night.
I kept myself up all night studying for the exam.