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Reference : Idioms : B : a bad hair day

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a bad hair day Informal

Meaning: If you're having a bad hair day, everything seems to be going wrong for you.

For example:

  • Poor Sue's in a terrible mood. I think she's having a bad hair day.

  • I knew it was going to be a bad hair day when my car wouldn't start.

Quick Quiz:

If you're having a bad hair day
  1. you've had a terrible haircut
  2. nothing's going right for you
  3. you don't care what people think about you