Retrieving "Constriction" from the archives

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1. Diphthong

   Linked via "constriction"

   Articulatorily, diphthongs are classified based on the direction of the glide relative to the starting vowel quality:
   Closing Diphthongs (Falling): The glide moves towards a position of higher constriction or vowel height (e.g., towards $/i/$ or $/u/$). Examples include the vowel in English's price ($\text{/aɪ/}$).
   Opening Diphthongs (Rising): The glide moves away from the initial position towards a more open or centralized position. These are less common in major [European l…