gully

Origin uncertain. Possibly from a variant of Middle English golet (“esophagus, gullet”), from Old French goulet, from Latin gula (“throat”). Shift in meaning in Middle English to "water channel, ravine" may have been influenced by Middle English gylle, gille, galle (“deep narrow valley, ravine”); see gill. Compare Dutch geul.

Alternatively, from a diminutive of dialectal gull (“fissue, chasm”) +‎ -y (diminutive suffix). See gull, gullick.

From Scots gully, of unknown origin.