Definition of "great wall" []

• A fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width (noun)

WordNet. Princeton University. 2010.

• "Then starting from a short distance behind them I ran swiftly up from one tier to the next, and with a final bound from the broad shoulders of the highest I clutched the top of the great wall and quietly drew myself to its broad expanse."
• "The abbey precincts covered about thirty acres and were surrounded on three sides by a great wall with four embattled gateways, one of which, the western or compter gate, served as the town prison."
• "Alexander almost certainly recruited some of these outlaws into his ranks as he headed toward the great wall of Mount Haemus stretching across the northern horizon."