Etymology
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Downing Street 
short street in London, named for British diplomat Sir George Downing (c. 1624-1684). It contains the residence of the prime minister (at Number 10), hence its metonymic use for "the British government," attested from 1781.
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Melbourne 

city in Australia, named 1837 for William Lamb (1779-1848), 2nd Viscount Melbourne, then British Prime Minister; the title is from Melbourne Hall, Derbyshire. The place name is literally "mill stream," Old English Mileburne (1086).

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