transitive verb.
To cut bend to an upward curve; to construct, as a deck, with an upward curve.
intransitive verb.
To curve upward.
noun.
An upward convexity of a deck or other surface.
noun.
An upward concavity in the under side of a beam, girder, or lintel; also, a slight upward concavity in a straight arch. See Hogback.
noun.
an arch whose intrados, though apparently straight, has a slightly concave curve upward.
noun.
a beam whose under side has a concave curve upward.