twist sb's arm

twist sb's arm ((to manage) to persuade someone to do something that they do not want to do; convince someone to do something or coerce; pressure someone to do something) — оказывать давление, давить на кого-л., надавить на кого-л.; уламывать, (долго) уговаривать, настаивать; обрабатывать (в зн. оказывать давление), ~ выкручивать руки; применять непозволительные методы

Example 1: You've twisted my arm. — Вы меня уломали.

Example 2: I wasn’t going to come, but Mark twisted my arm.

Example 3: I had to twist her arm a little, but she agreed. (thefreedictionary.com)

Example 4: Do I have to twist your arm, or will you cooperate?
(thefreedictionary.com)

Example 5: 'Have a cream cake?' 'Oh, go on then, if you twist my arm.' (CID)

More examples from englishbaby.com

...Okay, okay, I’ll do it. You don’t have to twist my arm.
...I was talking to Mandy the other day and she asked me to go to the Britney Spears concert. I’m not sure if I want to go, but she’ll probably twist my arm and talk me in to it.
... Hey Jonah, you don’t have to twist my arm to get me to go on a date with you. I think you’re cute.

Related vocabulary:

[hold a gun to sb's head]
[hold sb's feet to the fire]
at gunpoint