To be foolhardy and rash; to act with reckless abandon and lack of foresight.
在没有充分准备的情况下，他贸然投资，这种冯河暴虎的行为让他蒙受了损失。
Without adequate preparation, he rashly invested, and such a foolhardy act caused him losses.
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To be foolhardy and rash; to act with reckless abandon and lack of foresight.