Definition of be one's own worst enemy in English:

be one's own worst enemy

phrase

  • Act in a way contrary to one's own interests.

    ‘I try my best, but he's his own worst enemy’
    • ‘Hitler went from being a superb strategist in the early part of his rule to being his own worst enemy later on.’
    • ‘Not for the first time in my life, I had been my own worst enemy, but if people don't treat me correctly, I have to hit back at them.’
    • ‘The team were their own worst enemy as they squandered numerous chances in a nervous opening game.’
    • ‘But you can be your own worst enemy when there's a lot of negative chatter going on inside your head.’
    • ‘I think a lot of the time I can be my own worst enemy.’