the more the merrier

First recorded in the 14th-century poem Pearl, line 850. The phrase contains an instance of the comparative correlative use of the.

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the more the merrier

1. Something is more fun with more people.
2. A greater amount of something is better.
3. Used to welcome another person into a group activity or encourage them to join in, suggesting that they will be easily accommodated.

• “the more the merrier”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.