1. A narrow valley or ravine, especially one with a stream running through it.
Usage: chiefly British; common in place names in northern England and the Lake District
2. A small stream or brook, especially one flowing through a ravine.
Usage: chiefly British; regional

Examples

• The hikers descended into the ghyll to follow the mountain stream.
• Water cascaded down the rocky ghyll after the heavy rain.
• Many place names in the Lake District contain the word 'ghyll'.
• The narrow ghyll provided shelter from the wind on the exposed moor.
• A clear ghyll ran through the wooded valley.
• The children waded in the shallow ghyll during their countryside walk.