Proto-MSA

*ṯby - to moo (Kogan 2015:574)

The origin is unknown (Kogan 2015:574)

Mehri
ṯəbū - to moo, to low (ML 415)
Jibbali
ṯē - to moo, to low (JL 283)
Soqotri
tébe - to moo (a cow) (LS 438, CSOL II 608)