Past tense of accroach; having unlawfully seized or encroached upon authority or property.
Regular past tense formation from 'accroach' with the '-ed' suffix. The word remained consistent in its legal meaning throughout Middle and Early Modern English.
If you were a medieval peasant and a local lord 'accroached' the king's hunting rights, you'd better not be caught poaching deer—the legal consequences would be severe!
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