a spoken variety of English influenced by cockney, London speech, and Received Pronunciation, used in London and southeastern England in the area of the Thames estuary.
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British Dictionary definitions for estuary English
a variety of standard British English in which the pronunciation reflects various features characteristic of London and the Southeast of England
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012