usage: maintain a required pace or level; "He could not keep up and dropped out of the race"
2. prolong, sustain, keep up, continue, uphold, carry on, bear on, preserve
usage: 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"
3. conserve, preserve, maintain, keep up, keep
usage: 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"
4. keep up, keep abreast, follow
usage: keep informed; "He kept up on his country's foreign policies"
5. keep up
usage: 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"