chokehold

Short definition from Wiktionary

Noun

1. 1
   A grappling hold around a person's neck, especially one in which the neck is grasped tightly from behind with an arm, cutting off the flow of blood to the brain and restricting breathing.
2. 2
   A powerful and restrictive control or influence over something.

Verb

1. 1
   To put a hold around the neck of (someone), especially one in which the neck is grasped tightly from behind with an arm.