Webster’s Revised Unabridged Dictionary · 1913
Sidelong
Side′long′ (·lŏng′; 115), adv. [See Sideling, adv.] 1. Laterally; obliquely; in the direction of the side.
2. On the side; as, to lay a thing sidelong. [See Sideling, adv. ] Evelyn.
Side′long′, a. Lateral; oblique; not being directly in front; as, a sidelong glance.
The bashful virgin's sidelong looks of love. Goldsmith.