cāsū adv.
abl.of casus, by chance, casually, by accident, accidentally : casu Romae esse:id evenit non temere nec casu: sive casu sive consilio deorum, Cs.: accidit casu ut, etc., N.: casu te sortiri amicum, H.: si Pallerem casu, H.: casu tenebant bracchia nati, O.