wibuaka

Bingham: Hiram Bingham, A Gilbertese-English Dictionary (1908, 1953). American Board of Commissioners for Foreign Missions.
Sabatier: Ernest Sabatier, M.S.C., Dictionnaire Gilbertin-Français (1954), translated by Sr. M. Oliva as Gilbertese-English Dictionary (1971). South Pacific Commission Publications Bureau.

Bingham

wíbuaka

vi. to speak ill.

wibuaka

n. (1) bad language, coarse, rude words.

vt. wibuaka: to insult, to offend by rude words.

v. (2) to speak, to pronounce badly, to sputter, to murder a language.