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down-glide

down-glide Phonetics.
  A downward glide (see glide n. 4).

1930 H. Kurath in J. T. Hatfield et al. Curme Vol. Linguistic Studies 94 The up-glides and down-glides of the voice. 1932 G. E. Fuhrken Standard Eng. Speech xvi. 111 In that's his son the down-glide coincides with the end-consonant in son. 1965 Language XLI. 475 In stressed ballistic syllables the tones high, mid, and low are actualized as rapid downglides.

Oxford English Dictionary

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