Webster's Revised Unabridged Dictionary · 1913

Sidelong

Sidelong , adverb

[See Sideling, adv.]

1.
Laterally; obliquely; in the direction of the side.

[See Sideling, adv. ]

2.
On the side; as, to lay a thing sidelong. — Evelyn

Sidelong , adjective

Lateral; oblique; not being directly in front; as, a sidelong glance.
The bashful virgin's sidelong looks of love. — Goldsmith