biuk 1v To sag under a weight, such as as a floor or soft wood. Nabiuk dò ka so-og ka nig-unturan to mabogat di warò nagopù. The floor sagged when something heavy was placed on it but it didn't break. 2vs Become bent, as an arrow. Ka otow, nigtul-id din ka mgo tunod din su nabiuk. The person straigntened his arrows because they were bent. see: bouk 1.