The Collaborative International Dictionary
Unencumber
Unencumber \Un`en*cum"ber\, v. t. [1st pref. un- + encumber.] To free from incumbrance; to disencumber.
Wiktionary
unencumber
vb. 1 (context transitive English) To free something from incumbrance. 2 (context transitive English) To remove a burden, load or charge from something or someone.