For the lower lip (patient ma-) to more-or-less permanently protrude.
Mamelay di ngiwotnah un natā'ang.
His lower lip will permanently protrude if he always cries.
For someone (actor) to protrude the lower lip (theme -on), as in crying, or pouting.
meloyon
Nan ung'ungnga an kumiyol ya melayonday tīmidda.
As for children who cry, they protrude their (lower) lips.
-on: meloyon