entrenchment (n.)
- aqueduct
- bunker
- canal
- canalization
- channel
- confirmation
- countermine
- crimp
- cut
- dike
- ditch
- dugout
- encroachment
- entrance
- establishment
- fixation
- fixedness
- fixity
- fixture
- fosse
- foxhole
- gallery
- goffer
- gutter
- ha-ha
- impingement
- implantation
- imposition
- incursion
- infiltration
- influx
- infringement
- injection
- inroad
- insinuation
- interference
- interjection
- interposition
- interruption
- intervention
- intrusion
- invasion
- irruption
- kennel
- mine
- moat
- parallel
- pleat
- sap
- stabilization
- trench
- trespass
- trough
- tunnel
