retrench; dig in; dig a foxhole(When I was going through Marine officer training, one of the things we had to do was learn how to dig foxholes. For those of you not familiar with military traditions, a foxhole is a pit that combat troops dig to give them shelter from enemy attacks. 4uzhoj); entrench oneself; intrench oneself; emplace(об орудийном расчёте, бронетехнике 4uzhoj); lodge one's self
