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tr.v. coun·ter·sued, coun·ter·su·ing, coun·ter·sues Law
To respond to a lawsuit against oneself by suing (the plaintiff).
coun′ter·suit′ (-so͞ot′) 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.
(Law) law to sue (a plaintiff) in response or opposition to a preceding lawsuit
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014