Downing Street(redirected from 9 Downing Street)
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Downing Street,Westminster, London, England. On the street are the British Foreign Office and, at No. 10, the residence of the first lord of the Treasury, who is usually (although not necessarily) the prime minister of Great Britain. Since nearly all prime ministers from the time of Robert Walpole (18th cent.) have lived at No. 10, it has come to designate the British government.
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1. a street in W central London, in Westminster: official residences of the British prime minister and the chancellor of the exchequer
2. Informal the prime minister or the British Government
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005