1) Chemical reaction 
[chemistry] In chemistry, work-up refers to the series of manipulations required to isolate and purify the product(s) of a chemical reaction. Typically, these manipulations may include: For example, in the Grignard reaction between phenylmagnesium bromide and carbon dioxide in the form of dry ice gives the conjugate base of benzoic acid. Th...
(wurk´әp) the procedures done to arrive at a diagnosis, including history taking, laboratory tests, x-rays, and so on.
[v] - develop, as of an appetite
verb bolster or strengthen; `We worked up courage`; `build up confidence`; `ramp up security in the airports`