1. (verb) build up, work up, build, progress
form or accumulate steadily
"Resistance to the manager's plan built up quickly"; "Pressure is building up at the Indian-Pakistani border"
2. (verb) work up, get up
develop
"we worked up an as of an appetite"
3. (verb) build up, work up, build, ramp up
bolster or strengthen
"We worked up courage"; "build up confidence"; "ramp up security in the airports"
4. (verb) work out, work up
come up with
"His colleagues worked out his interesting idea"; "We worked up an ad for our client"
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Definition of work up 
