कृ

डुकृञ् = ड उ क र ञ
verb(fear) verb(stone + shining/sharp) surface = may refer to oldowan or achulean stone making = do ahnd hold stone shining surface (with fear/ be ware)
verb(fear) verb(hand held + water) surface = may refer to pre-oldowan movement, where the natural fear of water was overcome

कृञ् = क र ञ
shining/sharp stone surface = violence.

commentary
I do not know which meaning is correct, original meaning as now (291125)
But this धातु represents one of the most important juncture in the evolution of Homo from apes.
Interesting to observe that there is no डु in हिंसा.

रूढ अर्थ
हिंसायाम्
करणे