One of the mysteries of the English language finally explained.
A constitutional convention by which the Government may ratify a treaty or agreement without parliamentary approval once it has been open to parliamentary scrutiny for a period of twenty-one days and raised no objections.
1950s; earliest use found in The Times. From the name of Arthur Augustus William Harry Ponsonby, English politician and peace campaigner, who introduced the practice in 1924 + rule.
Ponsonby rule/ˈpɒns(ə)nbi ˌruːl/
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