A. knock off
Feedback knock off - 1. to stop working and go out 2. to reduce price 3. to make 4. to kill 5. to steal.
look down on - to disdain. hit back - to attack in response. let out - 1. to make a loud sound 2. to loosen a piece of clothing 3. to take money from somebody for a rent. 4. to set somebody free