Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
underprice [ʌndəˈpraɪs] vt занижа́ть (занизи́ть*perf) сли́шком ни́зкую це́ну на +acc
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.