counterattack

1. V-I If you counterattack, you attack someone who has attacked you. 反擊

The security forces counterattacked the following day and quelled the unrest. 安全部隊第二天進行了反擊，平息了騷亂。

2. N-COUNT Counterattack is also a noun. 反攻

The army began its counterattack this morning. 今天早晨部隊開始了反攻。