keep up

keep up (http://definr.com/keep up)

     v 1: maintain a required pace or level; "He could not keep up and
          dropped out of the race"
     2: lengthen or extend in duration or space; "We sustained the
        diplomatic negociations as long as possible"; "prolong the
        treatment of the patient"; "keep up the good work" [syn: prolong,
         sustain]
     3: keep in perfect or unaltered condition; "We preserve these
        archeological findings"; "The old lady could not keep up
        the building" [syn: preserve, maintain]
     4: keep informed; "He kept up on his country's foreign
        policies" [syn: keep abreast, follow]
     5: 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"