Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
furrow [ˈfʌrəu] n борозда́#
vt
to furrow one's brow хму́рить (нахму́рить perf) бро́ви
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.