Cupid's bow

Cu·pid's bow

C0807600 (kyo͞o′pĭdz bō′)n. pl. Cupid's bows An archery bow that curves inward at the center and usually outward at the ends.

Cupid's bow

n (Anatomy) a shape of the upper lip considered to resemble Cupid's double-curved bow

Cu′pid's bow′

(boʊ)
n. 1. a classical bow; the bow Cupid is traditionally pictured as bearing. 2. a line or shape resembling this, esp. the line of the upper lip. [1855–60]

Thesaurus

Noun	1.	Cupid's bow - the double curve of the upper lip when considered to resemble Cupid's bowcurve, curved shape - the trace of a point whose direction of motion changes
	2.	Cupid's bow - a curved bow with reversed curve endsbow - a weapon for shooting arrows, composed of a curved piece of resilient wood with a taut cord to propel the arrow