1
general::
Also, scrape together or up. Assemble or produce with considerable effort, as in We managed to scare up extra chairs for the unexpectedly large audience, or He managed to scrape together enough cash to buy two more tickets. The first term alludes to scare in the sense of "flush game out of cover" and dates from the mid-1800s; the variant, alluding to scratching or clawing for something, was first recorded in 1549. Also see SCRAPE UP AN ACQUAINTANCE.
American Heritage Idioms
2
general::
Phrase(s): scare someone or something up
Rur. to search for and find someone or something. • Go out in the kitchen and scare some food up. • I’ll see if I can scare up somebody to fix the broken chair.
McGrawhill's American Idioms And Phrasal Verbs