Definition & Meaning of "crossback"in English

What is the origin of the term "crossback" and how is it used?

"Crossback" is an English slang term that emerged in the 19th or early 20th century, formed from "cross" (referring to the Christian cross, particularly associated with Catholicism) and "back," implying someone who carries or follows it. It was used by non-Catholics to insult or disparage Catholics, often emphasizing perceived superstition, obedience, or religious difference. The term appears in informal speech, sectarian commentary, and historical writing. It is clearly derogatory, targeting religious identity rather than being neutral.