What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
proper noun
A city on the River Nile in southern Egypt, 16 km (10 miles) north of Lake Nasser; population 266,000 (est. 2006). Two dams across the Nile have been built nearby. The controlled release of water from Lake Nasser behind the High Dam produces the greater part of Egypt's electricity.
