counter-sue
White countersued Shenley for money he said he was owed by the firm.
As news of Mr Smith's lawsuit was revealed last week, Mr Green almost immediately announced plans to counter-sue his former employers for due compensation and damages.
The union plans to counter-sue the company for defamation.
The firm counter-sued for the cancellation of its contract.

SMART Vocabulary: related words and phrases

Taking legal action
abatement order
ambulance-chasing
appear for someone
bring
bring an action
complainant
indict
indictment
lawyer up
legal action
litigant
litigate
litigation
petitioner
prosecution
prosecutorial
reindict
reindictment
retry
summons