A-dumbian

According to the Old English Dictionary:

a-dumbian

p. ode, ede; pp. od, ed; or dumb; obmutescere :-- Adumba and gá of ðisum men obmutesce et exi de homine, Mk. Bos. 1, 25. Adumbiaþ ða fácnfullan weoloras muta efficiantur labia dolosa, Ps. Th. 30, 20. Ic adumbede obmutui, Ps. Spl. 38, 3. Ic adumbode, Ps. Lamb. 38, 10. a-dumbian

Related words: n. To hold one's peace, to keep silence, to become mute