Irish twins

Definition from Wiktionary, a free dictionary

Contents 1 English 1.1 Etymology 1.2 Noun 1.2.1 Usage notes

[edit] English

Wikipedia

[edit] Etymology

It references a perception about families of Irish Catholics who may not use birth control (and thus may have children in quicker succession).

[edit] Noun

Irish twins (plurale tantum)

1. Plural form of Irish twin.

[edit] Usage notes

• The term is not used in Ireland.
• The term can also be used more generally to refer to any siblings born close together.