Meaning of falling diphthong

fall'ing diph'thong

Pronunciation: [key]
— Phonet. Phonet.
  1. a diphthong in which the first of the two apparent vocalic elements is of greater stress or sonority and the second is of lesser stress or sonority, as in (ī), (ou), (oi), etc. Cf. rising diphthong.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.