glottal stop
US /ˈɡlɑː.t̬əl ˌstɑːp/
UK /ˈɡlɑː.t̬əl ˌstɑːp/
1.
a speech sound produced by complete closure of the glottis, followed by sudden release. It is found in many languages, including English (e.g., in the Cockney pronunciation of 'butter' as 'bu'er').
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The word 'uh-oh' contains a glottal stop.
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Many English dialects use a glottal stop in place of 't' sounds in certain positions.