dad-

• dat- (before b, d, dd, g, s^[1])

From Proto-Celtic *do-ate-,^[2] equivalent to dy- +‎ ad-. Cognate with Cornish das-.

• IPA^(key): /dad/

dad-

1. undo, un-, dis-

   ‎dad- + ‎pacio (“to pack”) → ‎dadbacio (“to unpack”)

   ‎dad- + ‎gwneud (“to do”) → ‎dad-wneud (“to undo”)

   ‎dad- + ‎llwytho (“to load”) → ‎dadlwytho (“to unload”)

   ‎dad- + ‎rhwymo (“to bind”) → ‎dadrwymo (“to unbind”)

2. re-

   ‎dad- + ‎ennill (“to win, to earn”) → ‎dadennill (“to regain”)