1. (n.) A large knife.

2. (n.) A channel or hollow worn in the earth by a current of water; a short deep portion of a torrent's bed when dry.

3. (n.) A grooved iron rail or tram plate.

4. (v. t.) To wear into a gully or into gullies.

5. (v. i.) To flow noisily.

abysm abyss aqueduct arroyo bed box canyon breach break canal canalize canyon carve cavity chamfer channel chap chasm check chimney chink chisel cleft cleuch clough col corridor corrugate coulee couloir crack cranny creek bed crevasse crevice crimp culvert cut cwm dado defile dell dike ditch donga draw dry bed engrave excavation fault fissure flaw flume flute fracture furrow gap gape gash gill goffer gorge gouge groove gulch gulf gullyhole headrace hole incise incision irrigation ditch joint kloof leak moat notch nullah opening pass passage pleat plow rabbet race ravine rent rifle rift rime river bed riverway runnel rupture rut scissure score scratch seam slit slot sluice spillbox spillway split streak stream bed streamway striate swash swash channel tailrace trench trough valley void wadi water carrier water channel water furrow water gap water gate watercourse waterway waterworks wrinkle