bilas 1 noun English. Spouses of siblings or of first cousins, also vocative. verb English. Is bilas or calls s.o. else such. Example sentence: Subanen. Ki getaw sa' meksalabuuk di penugangan, ngalanen megidas. English. Persons who share parents-in-law are called being idas. Synonym. idas c.f. bati'; bayaw; ipag; kati'