unilateralism
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/ˌjuːnɪˈlætrəlɪzəm/
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/ˌjuːnɪˈlætrəlɪzəm/
The policy of taking action without the support or agreement of others, especially in politics.
The country's decision to pursue unilateralism in its foreign policy was met with criticism from its allies.
該國決定在外交政策中奉行單邊主義,遭到了其盟友的批評。