sexual activity in general

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turn someone off

turn someone off [idiom]

To displease someone; make someone detest something greatly (can have sexual or physical implications)

حال کسی را به هم زدن، نسبت به کسی بی میل شدن

مثال:

Martha really turned me off when she ate salad with her unwashed hands. It was really disgusting the way she picked cucumbers with her fingernails!

urn-off 4 turn somebody ↔ off to make someone decide they do not like something :

Any prospective buyer will be turned off by the sight of rotting wood.

Cambridge Advanced Learner's Dictionary - 4th Edition

turn sb off informal — phrasal verb with turn / tɜːn / / tɝːn / verb

to stop someone feeling interested or excited, especially sexually:

I should think the smell of her breath would turn any man off.