{i} act of cutting back, curtailment; reduction, diminishment; inner structure that serves as a second line of defense within a fort
A work constructed within another, to prolong the defense of the position when the enemy has gained possession of the outer work; or to protect the defenders till they can retreat or obtain terms for a capitulation
the reduction of expenditures in order to become financial stable entrenchment consisting of an additional interior fortification to prolong the defense
Retrenchment means spending less money. Defense planners predict an extended period of retrenchment