Also found in: Medical.
tr.v. un·der·used, un·der·us·ing, un·der·us·es
To use to a lesser degree than is normal or desirable.
un′der·use′ (-yo͞os′) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(tr) to use to an insufficient degree
the condition of being not used as much as it could or should be
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014