countersue
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coun·ter·sue
(koun′tər-so͞o′)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.
countersue
(ˈkaʊntəˌsuː)vb (tr)
(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