give your right arm
US /ɡɪv jʊər raɪt ɑːrm/
UK /ɡɪv jʊər raɪt ɑːrm/
1.
to be willing to do anything or pay any price for something you really want
:
•
I'd give my right arm to travel the world.
•
She would give her right arm to get that promotion.