A liquid (-om-) bubbles, froths.
Sombo danaw ranom do baldi.
The water in the barrel (which is cooking the root crops) already bubbles.
Sombo Coke an makoyon.
Coke will froth when it is shaken.
A liquid (mang-) bubbles over, froths over something (-an).
Inasbwan magborek a ranom iyaw kaldero.
The boiling water bubbles over the pot.