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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Definitions of Downing Street

Downing Street (n.)
a street of Westminster in London;
Downing Street (n.)
the British government;
From wordnet.princeton.edu