[gul.ly] n, pl gullies [short for E dial. gully knife] (1582) dial Brit: a large knife
[2]gul.ly also gul.ley n, pl gullies [obs. E gully (gullet)] (1637) 1: a trench which was orig. worn in the earth by running water and through which water often runs after rains
2: a small valley or gulch [3]gul.ly vb gul.lied ; gul.ly.ing vt (1754): to make gullies in ~ vi: to undergo erosion: form gullies