wrap someone around your little finger
US /ræp ˈsʌm.wʌn əˈraʊnd jʊər ˈlɪt.əl ˈfɪŋ.ɡər/
UK /ræp ˈsʌm.wʌn əˈraʊnd jʊər ˈlɪt.əl ˈfɪŋ.ɡər/

1.
jemanden um den kleinen Finger wickeln, jemanden völlig beherrschen
to have complete control over someone and be able to persuade them to do anything you want
:
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She can wrap him around her little finger; he'll do anything she asks.
Sie kann ihn um ihren kleinen Finger wickeln; er wird alles tun, was sie verlangt.
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My youngest child always manages to wrap me around her little finger to get what she wants.
Mein jüngstes Kind schafft es immer, mich um ihren kleinen Finger zu wickeln, um zu bekommen, was sie will.