show s.b. a finger and he will ...

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Senior Member
Bulgaria, Bulgarian
In Bulgarian we have a saying which literally sounds like this- If you show him/her a finger he/she will eat your arm up to the elbow, which means that the person in question is never satisfied/content/pleased with the (number of) favours you are doing for him.
Sample sentence- I've done him a lot of favours but he is never satisfied and wants more- show him your finger and he will eat you arm right to the elbow.
Is there a similar idiomatic expression in English?
Thank you
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