is the sound of the double d in suddenly a glottal stop (ʔ)?

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Phonology & Phonetics Archives - Page 2 of 3 - The Historical Linguist Channel

Glottal stop - Wikipedia

The Glottal Stop /ʔ/ - connected speech

Universidade Paulista - UNIP】 は 英語 (アメリカ) で何と言いますか

Are there consonants that humans can't pronounce? Have any such new consonants been discovered, or has anyone tried to create such new artificial sounds? - Quora

Assimilation: Linking /t/ as Glottal Stop /ʔ/ — Pronuncian: American English Pronunciation

Language Log » Glottal stalking: Cockneys everywhere

IPA Chart With Explanation, PDF, Consonant

ʔ ] unvoiced unaspirated radical glottal stop

Phonetics

Pronouncing consonants

Language Log » Glottal stalking: Cockneys everywhere

How many sounds are there in the International Phonetic Alphabet? - Quora