work up
     v 1: form or accumulate steadily; "Resistance to the manager's
          plan built up quickly"; "Pressure is building up at the
          Indian-Pakistani border" [syn: {build up}, {build}, {progress}]
     2: develop; "we worked up an as of an appetite" [syn: {get up}]
     3: bolster or strengthen; "We worked up courage"; "build up
        confidence"; "ramp up security in the airports" [syn: {build
        up}, {build}, {ramp up}]
     4: come up with; "His colleagues worked out his interesting
        idea"; "We worked up an ad for our client" [syn: {work out}]
Source: WordNet® 2.0