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turn upside down (third-person singular simple present turns upside down, present participle turning upside down, simple past and past participle turned upside down)

  1. (transitive, intransitive) To flip over; to rotate top to bottom.
    Turn the box upside down and look at the bottom.
    Synonyms: flip over, turn over
  2. (transitive, idiomatic) To thoroughly examine.
    They turned the house upside down looking for the car keys.

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