(1):

(v. i.) To cause or suffer retrenchment; specifically, to cut down living expenses; as, it is more reputable to retrench than to live embarrassed.

(2):

(v. t.) To furnish with a retrenchment; as, to retrench bastions.

(3):

(v. t.) To cut off; to pare away.

(4):

(v. t.) To lessen; to abridge; to curtail; as, to retrench superfluities or expenses.

(5):

(v. t.) To confine; to limit; to restrict.