tubak verb English. Slides, of earth on an incline, landslide. Example sentence: Subanen. Tumu' mikula'ula' gupia su pelayan ku, sungu na dema sia mainug, migulagut pelum metubak. English. I think my rice field has been entirely destroyed; just when it was about to get ripe, a landslide came down on it. Example sentence: Subanen. Ndi' mu engkulay diin, pu' mektubak. English. Don't hollow out the ground there, because it will slide. Synonym. tugdus