Definition of Offa's Dyke from the Oxford Advanced Learner's Dictionary

 

Offa's Dyke

 
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a large bank of earth along the border between England and Wales. It was built in the 8th century by Offa, a king of Mercia, as a protection against the Britons who lived to the west of it. Later, it became the border between the two countries. Today Offa's Dyke is a National Trail and people enjoy walking along it, or parts of it.