We use this expression to say that we want as many people as possible to do something.
You can use this phrase in ………… language.
Spoken
Written
Formal
Informal
Example 1
A: Can I bring my wife to your party?
B: Sure, the more the merrier.
Example 2
A: How many children shall we invite for Anna’s Barbie party?
B: Ten or fifteen – the more the merrier, I think.