Quick definitions from Wiktionary (many happy returns)
▸ noun: (idiomatic) A greeting, usually for birthdays, in reference to the passing year; Happy birthday!
▸ Words similar to many happy returns
▸ Usage examples for many happy returns
▸ Idioms related to many happy returns (New!)
▸ Words that often appear near many happy returns
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▸ noun: (idiomatic) A greeting, usually for birthdays, in reference to the passing year; Happy birthday!
▸ Words similar to many happy returns
▸ Usage examples for many happy returns
▸ Idioms related to many happy returns (New!)
▸ Words that often appear near many happy returns
▸ Rhymes of many happy returns
▸ Invented words related to many happy returns