| 1. | a street in W central London, England: cabinet office; residence of the prime minister. |
| 2. | the British prime minister and cabinet. |
| Downing Street 1 A thoroughfare of Westminster in London, England, off Whitehall. No. 10 Downing Street is the official residence of the first lord of the Treasury, who is usually but not necessarily the prime minister of Great Britain. Nearly all prime ministers have lived at No. 10 since the time of Robert Walpole in the early 1700s. |
| Downing Street 2 n. The British government. |