Irish-twin Definition
noun
(slang) Either of a pair of siblings born less than 12 months apart, especially if born within the same calendar year.
Wiktionary
Other Word Forms of Irish-twin
Noun
Singular:
irish-twin
Plural:
irish-twinsOrigin of Irish-twin
Based on the relatively higher fecundity of Irish people, especially of immigrants, in the nineteenth century.
From Wiktionary
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