To make something Irish in character, style, or expression, or to convert into an Irish form or custom.
From 'Hibernia' (Latin for Ireland) plus '-ize' (verb suffix meaning to make or become). The term developed in the 19th century to describe linguistic and cultural transformation.
When Irish immigrants to America adapted English words and phrases to sound Irish, they were essentially hibernicizing them—language constantly gets flavored by the cultures that speak it.
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