Syriac

rgm - to stone (LSyr. 712, SL 1435)

PCS
*rgm - to stone (Kogan 2015: 217)
See also Proto-MSA *rgm - to cover The reconstruction in HALOT 1187: “The basic meaning develops from ‘to heap up stones’ > ‘to stone’ > ‘to curse’ > ‘to make a statement’” appears highly improbable, especially in its latter step (“to curse” > “to make a statement”)