Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
natter [ˈnætər] (BRIT) vi трепа́ться*(impf)
n
to have a natterтрепа́ться*(потрепа́ться*perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.