gul ‧ ly BrE AmE , gulley /ˈɡʌli/ noun ( plural gullies ) [countable]
[ Date: 1600-1700 ; Origin: gully 'throat' (1500-1600) , probably from gullet ]
1 . a small narrow valley, usually formed by a lot of rain flowing down the side of a hill
2 . a deep ↑ ditch
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THESAURUS
▪ valley an area of lower land between two lines of hills or mountains, usually with a river flowing through it:
The route passes through a remote mountain valley.
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a trek up the Gokyo Valley to see Mount Everest
▪ gorge a deep narrow valley with steep sides - often used in names, especially in Europe:
The river flows through a deep gorge.
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Cheddar Gorge
▪ canyon a deep valley with very steep sides - often used in names, especially in North and South America:
She looked down the side of the canyon.
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We visited the Grand Canyon in Arizona.
▪ ravine a small valley with very steep sides:
He fell down a ravine.
▪ glen a deep narrow valley in Scotland or Ireland:
They followed the river along the glen.
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the Glens of Antrim
▪ gully a small narrow valley, usually formed by a lot of rain flowing down the side of a hill:
They reached the top by scrambling up a gully.