PWS

*kd - to tread, to walk slowly (?) (Kogan 2015: 462)

The biconsonantal root is most prominantly represented by PES *kyd.

PES
*kyd - to tread, to trample, to walk (CDG 301; LLA 872; Kogan 2015: 461)

Arabic
kadīd- - ground trodden with the hoofs of horses; fine dust trodden with the feet (Lane 2595)
Arabic
kdkd - to run slowly (Lane 2595)
Mehri
kdū - to make (a camel) trot (ML 203)
Jibbali
kédé - (camel) to trot (JL 126)