retroflex (Adjective) — Bent or curved backward.
retroflex (Adjective) — (linguistics) pronounced with the tip of the tongue turned back toward the hard palate.
retroflex (Verb) — Bend or turn backward.
retroflex (Verb) — Articulate (a consonant) with the tongue curled back against the palate. ex. "Indian accents can be characterized by the fact that speakers retroflex their consonants"