The two countries have each expelled another diplomat following a round of tit-for-tat expulsions.

在一轮以牙还牙的驱逐行动之后，这两个国家又分别驱逐了一位外交官。

《柯林斯英汉双解大词典》

The United States and China have exchanged accusations of dumping for years and imposed tit-for-tat duties.

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The speculation on the street is that it was a tit-for-tat assassination between rival gangs.

NPR: Film Adds Fuel to Venezuela's Social Fires

In the 1930s, the Smoot-Hawley tariff provoked tit-for-tat responses and a collapse of world trade.

ECONOMIST: Unfair protection | The