Meaning of “the world and his wife” in the English Dictionary

british dictionary

"the world and his wife" in British English

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the world and his wife

UK

a great many people, especially in a particular place at a particular time:

It's going to be quite a party - the world and his wife will be there.

(Definition of “the world and his wife” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)