Have your hands tied
Definition 1 of 1
Pro Tip 1/3Metaphorical Use
The phrase borrows from the physical restraint of hands to express limitation in action or decision. 
I wanted to approve your request, but with the current policy, I have my hands tied.
Pro Tip 2/3Non-literal Meaning
It's not about actual ropes or bonds, but a metaphor for being restricted by rules or circumstances. 
As much as I want to lower the price for you, I have my hands tied by the store's regulations.
Pro Tip 3/3Professional Context
Often used in work or legal situations, where rules prevent someone from acting. 
We cannot process refunds without a receipt; our hands are tied by company policy.