Dictionary
coun•ter•sue
Pronunciation: (koun'tur-sOO"), [key]
—v., -sued, -su•ing.
—
v.t.
to bring a civil action against (one's complainant).
—
v.i.
to bring a civil action against one's complainant.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.