vergraulen

20th century, from ver- + graulen (“to be scared”, rare or regional). The latter is from earlier graueln, a variant of (also rare) gräueln, from Middle High German griuweln, grūweln, whence the noun Gräuel (“horror”). The form with -ūw- (modern -au-) probably shows the same Central German development as in brauen, kauen. The change from -eln to -len is unremarkable (in fact, many speakers merge these entirely).