Morphologically ma + bunlhaz.
mabunlhaz
- be ripe with fruit, flesh
huya wa buhat pubunak, maqa mathuaw mabunlhaz ya palhuizaan sa buna.- That garden has been planted with sweet potatoes by me, because when sweet potatoes are cultivated they produce a lot of flesh.
那塊園子被我種了甘薯,因為如果種的是甘薯很會結實。