I learned this phrase from Al-Anon by several sources. It means that when you're in a tug-of-war with somebody else or even yourself you have the right and choice to just drop the rope and walk away!!!
I find that very helpful for Nicotine Recovery as well. It doesn't mean that I give up! It means I choose not to engage with my Nicotine thoughts. I have better things to do with my brain.
Hopefully somebody else will find this simple idea useful as well!