the street in central London that contains the official houses of the British Prime Minister, at number 10, and the Chancellor of the Exchequer (=chief financial minister) at number 11. The name Downing Street is often used to mean the Prime Minister and his/her officials, or the government of the UK:
• Downing Street announced last night that peace talks with the IRA had lead to a breakthrough.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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