Hlówan

According to the Old English Dictionary:

hlówan

p. hleów To low, bellow, make a loud noise :-- Oxa hléwþ bos mugit, Ælfc. Gr. 22; Som. 24, 9. Hleówon hornboran the trumpeters sounded, Elen. Kmbl. 107; El. 54. Hlówendra fearras flǽsc the flesh of lowing oxen, Homl. Th. i. 590, 15. [Icel. hlóa to roar (of streams): O. H. Ger. hlóon mugire, rudere.] hlowan