1.
If you work yourself up, you make yourself feel very upset or angry about something.
She worked herself up into a bit of a state...
Don’t just lie there working yourself up, do something about it.
PHRASAL VERB: V pron-refl P into/to n, V pron-refl P
see also worked up
2.
If you ~ the enthusiasm or courage to do something, you succeed in making yourself feel it.
Your creative talents can also be put to good use, if you can ~ the energy...
PHRASAL VERB: V P n (not pron)
3.
If you ~ a sweat or an appetite, you make yourself sweaty or hungry by doing exercise or hard work.
You can really ~ a sweat doing housework...
PHRASAL VERB: V P n (not pron)
4.
If you ~ something such as a piece of writing, you spend time and effort preparing it.
I sketched the layout of a prototype store and worked up a business plan...
PHRASAL VERB: V P n (not pron)