Gully (noun)

1. A deep channel worn into the earth by running water, typically in a mountainous or hilly area.
2. A long, narrow trench or channel made by running water, especially in a field or on a hillside.

Origin:

From middle english golli, of celtic origin; related to irish and scottish gaelic gual, welsh gwael.

Examples:

1. The heavy rain caused the gully to overflow and flood the road.
2. He fell into the gully and got hurt.
3. The gully was caused by erosion from the stream.
4. The gully was filled with water after the storm.
5. The gully was deep and narrow with steep sides.