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