Catholic twins

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Noun

Catholic twins pl (normally plural, singular Catholic twin)

1. (slang) Siblings born within twelve months of each other.

   Synonym: Irish twins

   • 2008, Shelly Laurenston, The Mane Attraction, page 139:

     “Aunt Sissy!” a young voice screeched, then Sissy was besieged by five kids who looked barely a year apart. What his mom would call Catholic Twins.

2. Used other than figuratively or idiomatically: see Catholic,‎ twin.