To abandon oneself to despair and make a bad situation even worse; to give up entirely and behave recklessly after an initial mistake or setback.
小明考试没考好，不是反思错误，反而破罐破摔，彻底放弃了学习。
Xiao Ming didn't do well on the exam. Instead of reflecting on his mistakes, he threw caution to the winds and completely gave up on studying.
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