to mix (clay or the like) with water, so as to form a liquid suspension.
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British Dictionary definitions for blunge
(tr) to mix (clay or a similar substance) with water in order to form a suspension for use in ceramics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012