Entry 2 senses · 2 variants Webster, 1913 Sideling · Side·ling · IPA adv. a. 01 adv. Sidelong; on the side; laterally; also, obliquely; askew. 1. Sidelong; on the side; laterally; also, obliquely; askew. “A fellow nailed up maps . . . some sideling, and others upside down.” — Swift. 02 a. Inclining to one side; directed toward one side; sloping; inclined; as, sideling ground. 1. Inclining to one side; directed toward one side; sloping; inclined; as, sideling ground.