Catholic Twins Meaning
(slang) siblings born within twelve months of each other.
Example: Used other than as an idiom: see Catholic,‎ twin.
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.
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