Ge-cnúwian

According to the Old English Dictionary:

ge-cnúwian

pp. -cnúwad, -cnúad To pound together :-- Genim rúdan and wermód, gecnúwa and meng wiþ eced and ele, Lch. ii. 18, 6: 12: 19. Gecnúa on ceald wæter, 20, 3: 94, 6: 322, 26. Finoles wyrttruman gecnúadne, 30, 6. ge-cnuwian