Allofams:
6.0 Verbs of Motion, of Manipulation, and of Production > 6.8 Striking, hitting verbs

#5754 PTB *g-(y/r)aːp FAN / WINNOW / PADDLE / WAVE (v.) / BEAT / THRASH

This etymon comprises two allofams, formerly considered to be separate roots: one with a rhotic and one with a palatal element. Both variants reflect a velar pre-initial. Many languages, e.g. WT, Chepang, and Ao (Chungli), have doublets, preserving reflexes of both allofams.