make an empty show of strength;be swashbuckling;be full of bravado;bluff and bluster;bravado ;

There is a chance that the phoney war of the past three months will turn into real fighting.
过去3个月的虚张声势有可能演变成真正的战争。
来源:《柯林斯高阶英汉双解学习词典》It is too early to say whether the threats are mere sabre-rattling.
现在断言这些威胁是否只是虚张声势还为时过早。
来源:《柯林斯高阶英汉双解学习词典》
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