If a person or organization retrenches, they spend less money. Shortly afterwards, cuts in defence spending forced the aerospace industry to retrench. if a government or organization retrenches, it spends less money = economize (Early retrencher, from trenchier )
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