Sile, to. To pour. “It siles wi’ rain.”
Skelp, to. To empty a cart by tilting it.
Skirth. A fen drain.
Slape. Slippery, as roads after frost.
Slappy or sloppy. Muddy and moist.
Slither, to. To slide on ice.
Slive, to. To slip or creep slowly on. “The night slives on.”
Slosh. Aslant, as a path running slosh across a field.
Sloven. The stump of a tree.
Smock-raffled. Taken aback, puzzled.