The tongue-tip begins in retroflex position, but then moves forward rapidly, flapping against the alveolar ridge.
From the en.wikipedia.org
The forward place of articulation is apicalalveolar, which means it is articulated with the tip of the tongue against the alveolar ridge.
From the en.wikipedia.org
A phonetic term of the secondary articulation of consonants by which the body of the tongue is raised toward the hard palate and the alveolar ridge during the articulation of the consonant.
From the en.wikipedia.org
The forward place of articulation is dental or alveolar and laminal, which means it is articulated with the tip of the tongue against the alveolar ridge or the upper teeth.
From the en.wikipedia.org
A retroflex consonant is a coronal consonant where the tongue has a flat, concave, or even curled shape, and is articulated between the alveolar ridge and the hard palate.