rurunga

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

rurúnga

vi. to roar, to roll or rumble as of thunder.

rurunga

from. ruru.

n. rumbling noise, roll of thunder, roaring of waves, trains, planes, etc.

v. to shake the ground, to resound, to thunder, to rumble.

vc. karurunga: makes...
karurunga: idem.