What is that technique called in martial arts when someone immobilises someone with a knife?

I saw a technique in kung fu in which someone is laying down and the other person is about to stab them with a knife, but the person's laying down left hand grabs the hand that the attack is holding the weapon in and twisting it up their back, then with the free hand, grab the throat, bringing them down to the ground. I heard it's called a "dim lo" and its a sister move derived from a "dim mak". What is this technique