Retroflex sounds are produced by the curving the tongue backwards just behind the alveolar ridge. Many speakers of English produce the r sound of English ([ɹ]) as a retroflex consonant.
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- Crystal, David. (1997) A Dictionary of Linguistics and Phonetics. Oxford, UK: Blackwell.
- Ladefoged, D. (2010) A Course in Phonetics. 6th Edition. Wadsworth Publishing.