Meaning

noun entrenchment consisting of an additional interior fortification to prolong the defense

noun the reduction of expenditures in order to become financially stable

originProbably partly from both of the following: * Middle French retrenchement, retranchement (“removal of a portion from a larger whole; reduction of expenses”) (modern French retranchement (“deduction, subtraction”)), from retrancher, retranchier (“to get rid of, remove completely; to remove a portion from a larger whole; to reduce expenses; to deprive (oneself) of”) [and other forms] + -ment…

Etymology from Wiktionary, CC BY-SA 3.0