Webster’s Revised Unabridged Dictionary · 1913
Sideling
Side′ling (·lĭng), adv. [OE. sideling, fr. side side. See Side, and cf. Sidelong, Headlong.] Sidelong; on the side; laterally; also, obliquely; askew.
A fellow nailed up maps . . . some sideling, and others upside down. Swift.
Side′ling, a. Inclining to one side; directed toward one side; sloping; inclined; as, sideling ground.