βῆβῆ

A. baa, the ery of sheep, βῆ βῆ λέγων βαδίζει Cratin. 43.cf. Ar. Fr. 642, Varro RR 2.1:—hence βηβήν· πρόβατον, and βήζει· φωνεῖ, Hsch.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project