tobal 1v To collapse. [As sides of a tunnel, a large building like the World Trade Center, a stack of sacks or a pile of rocks that collapse when walked on.] see fr.: bulang 1. 2Collapse and wash away. Natobal ka lobong ni Tuyo-ong. Tuyo-ong’s grave collapsed and washed away. Ka tikoba, nakutkutan diò to diralom no natobal on to woig. As for the bank, it was dug out at the bottom and was collapsed and washed away [by the water].