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Today I heard in two (totally unrelated) videos the same unexpected pronunciation of the word 'assume' by native speakers. Googling came up with /əˈsjuːm/ both for English and American pronunciation (and that's also what I had expected. However, what I heard in those videos clearly was something like "a-shoom". Is that a specific dialect?
1Link to videos please – Peter – 2016-04-24T10:11:36.753
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"Yod coalescence (uncountable) (phonology): A process in English phonology whereby the clusters [dj], [tj], [sj], and [zj] become [dʒ], [tʃ], [ʃ], and [ʒ], respectively, through mutual assimilation." (Wiktionary). In your case, the cluster [sj] becomes [ʃ].
– Yay – 2016-04-24T10:29:41.2631Your average American English speaker does not pronounce the word as either /əˈsjuːm/ or /əˈ ʃuːm/... that is some kind of British English pronunciation. – Alan Carmack – 2016-04-26T00:26:20.757