Synonyms:
- abri,
- approach trench,
- aqueduct,
- bunker,
- canal,
- canalization,
- channel,
- communication trench,
- countermine,
- coupure,
- crimp,
- cut,
- dike,
- ditch,
- double sap,
- dugout,
- entrenchment,
- fire trench,
- flying sap,
- fortified tunnel,
- foxhole,
- gallery,
- goffer,
- gutter,
- ha-ha,
- kennel,
- mine,
- moat,
- parallel,
- pleat,
- sap,
- slit trench,
- sunk fence,
- trench,
- trough,
- tunnel