Open English Wordnet
Verbs
(v)keep upmaintain a required pace or level“He could not keep up and dropped out of the race” (v)prolong, sustain, keep uplengthen 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” (v)conserve, preserve, maintain, keep upkeep 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” (v)keep upprevent 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”