Definition of 尻馬に乗る
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(exp, v5r) to follow suit; to imitate or follow someone blindly
アメリカの尻馬に乗るなというセリフに正面から反論するのが、どれほどしんどいことだったことか。
Just how tiresome was it to argue straight against the phrase "Don't blindly follow America's lead!" - to ride on someone's back; to ride someone's coattails; to take advantage, e.g. of another's popularity