Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
boast [bəust] vt горди́ться (impf) +instr
vi
to boast (about or of) хва́статься (похва́статься perf) (+instr)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: