turn upside down

• turn upside-down

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.

   Synonyms: flip over, turn over

   Turn the box upside down and look at the bottom.

2. (transitive, idiomatic) To thoroughly examine.

   They turned the house upside down looking for the car keys.

3. (transitive, idiomatic) To alter (something) significantly, often in a negative way.
   • 2003 October 30, Daniel Taylor, “Ferdinand may miss Euro 2004”, in The Guardian‎^[1]:

     Rio Ferdinand will almost certainly miss out on Euro 2004, and possibly much more, because of the missed drug test which has turned his life upside down.