amorous glance; flirtatious look; wink
Literary and somewhat dated; used for a woman's seductive or inviting glance. Often appears in the set phrase 秋波を送る (to cast an amorous glance).
彼女は彼に秋波を送った。
She cast an amorous glance at him.
casting a coquettish glance (at a man)
amorous glance; making eyes at; covert flirtation
From Chinese origin, literally 'autumn waves', a poetic metaphor for the clear, rippling beauty of a woman's eyes and their seductive glance.