Dic: legwork (as a noun)

• I don't mind making the phone calls if you do the legwork.
• I have a gopher to do the legwork for me.
• A lot of new authors, however, hold the mistaken belief that the publishing house is going to do all of the legwork in promoting it. (출처: eHow)

1. the physical work accompanying a task.
2. (informal) difficult or boring work that takes a lot of time and effort, but that is thought to be less important.
3. (Informal) Work, such as collecting information or doing research in preparation for a project, that involves much walking or traveling about.

... McGrow-Hill, OALD, The American Heritage