Abarim Publications' online Biblical Hebrew Dictionary
The verb יבב (yabab) means to cry shrilly. It also occurs in Aramaic, where it means to exult or sound (clarions), curiously enough. In the Bible our verb occurs only once:
"Out the window she looked and lamented, the mother of Sisera, through the lattice . . . " - Judges 5:28
This verb has no extant derivatives.