IPA: /ˈkaʊntərˌsuː/
KK: /ˈkaʊntərˌsu/
To take legal action against someone who has already taken legal action against you.
After being sued for breach of contract, the company decided to countersue for damages.
Past: countersued
Past Participle: countersued
Countersue → It is formed from "counter-" (meaning against) and "sue" (from Old French *suer*, meaning to follow or pursue in a legal context). The word "countersue" means to pursue a legal action against someone who has already sued you.
Think of 'counter-' meaning against, and 'sue' meaning to pursue legally. This helps you remember that to countersue means to take legal action against someone who has already taken action against you.
No commonly confused words.