To nurse a tiger to bite oneself; to foster a danger that eventually harms oneself; to suffer from one's own leniency or mistakes.
他当初不该对那些不良行为视而不见，如今这些问题闹大了，真是养虎自啮。
He shouldn't have turned a blind eye to those bad behaviors in the first place; now these problems have escalated, truly a case of nursing a tiger to bite oneself.
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