The Collaborative International Dictionary
Unsluice
Unsluice \Un*sluice"\, v. t. [1st pref. un- + sluice.]
To sluice; to open the sluice or sluices of; to let flow; to
discharge.
--Dryden.
Wiktionary
unsluice
vb. (context transitive English) To sluice; to open the sluice or sluices of; to let flow; to discharge.