- to bring a civil action against (one's complainant).
- to bring a civil action against one's complainant.
Origin of countersue
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for countersue
But he does countersue the corporations set up by the lawyers of the families that allow them to gain standing in North Carolina.Who Should Kill? Looking for Answers in Erik Prince’s Memoir
November 22, 2013