Ebbian

According to the Old English Dictionary:

ebbian

p. ode, ade; pp. od, ad [ebba an ebb] To ebb; recēdĕre, refluĕre :-- Will-flód ongan lytligan eft, lago ebbade sweart under swegle the well-flood began again to lessen, the water ebbed dark under the firmament, Cd. 71; Th. 85, 12; Gen. 1413. DER. a-ebbian, be-, ge-: æbbung, sǽ. ebbian