Source : WordNet®

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 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" [syn: {conserve},
         {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"