Entry 2 senses Webster, 1913 bulging · IPA /ˈbʌldʒɪŋ/ 01 adj. curving or bulging outward. Opposite of concave. 1. curving or bulging outward. Opposite of concave. 2. curving outward. Syn. convex. — Syn. -- bellied, bellying, bulbous, bulgy, protuberant.