foundation of a wall, in stock phrase daḷh˚; etc. DN.iii.101; SN.v.194 = also at Ja.vi.276 (= pākāra-vatthu C.). Kern,

Toevoegselen

s. v. refers it to Sk. ud-vapati to dig out, and translates “moat, ditch”. The meaning “wall” or “mound” however harmonises quite well with the der. fr. “digging”, cp. E. dike → Ger. Teich. See also uddāma 2.

*udvāpa