gunboat diplomacy
noun/ˌɡʌnbəʊt dɪˈpləʊməsi/
/ˌɡʌnbəʊt dɪˈpləʊməsi/
[uncountable]- a way of making another country accept your demands by using the threat of force
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gunboat diplomacy
Definition of gunboat diplomacy noun from the Oxford Advanced Learner's Dictionary