PS

*rby - to be large (Kogan 2015: 196–197)

PCS
*rbb - to be large, numerous (Kogan 2015: 196)

Akkadian
rabû - big (CAD R 26, AHw. 936)
Hebrew
rby - to become numerous; to be great (HALOT 1176)
Syriac
rby - to become big; to increase (LSyr. 707, SL 1427)
Arabic
rbw - to increase, augment (Lane 1023)