Turned her back on me

[Stephan]

Test No. incompl/inter-34 "Story (3)", answer 6

Sadly Doris had already turned her back on me and gone back to the kitchen.

Correct answer: (c) on

Your answer was: incorrect
Sadly Doris had already turned her back out me and gone back to the kitchen.

Hello Alan! Please explain me: Why is the phrase "her back on me..." correct? To my mind is "her back out..." true.
Best wishes.
Stephan, Europe

[Alan]

Hi,

Thanks for your message. Unfortunately there is no logic to idioms and this is an idiom. Turn your back on someone is to turn your back so that your back is facing them and this means that you walk away from them or ignore them. I'm afraid your suggestion of 'out' doesn't work.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Stephan]

Thank you very much for your explanation, Alan!
Your tests are very useful and help me in my schoolwork.

[Ft_Louie]

Dear teacher,
I don't understand why we can't use ' against' here. I think it sounds quite appropriate. Please, give me the explanation.
Thanks in advance!

[Beeesneees]

'Turned her back against me', she stood right up close to me, but facing away with her back touching me.

'Turned her back to me'. She turned so that her back was facing toward me.
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Cheers m' dears!

[Ft_Louie]

Ah, I get it now!!! Thank you ever so much!!!!