"To run the code" means to execute or start the computer program that has been written. It refers to the action of running or activating the program so that it performs its designated tasks. Full definition
While we recommend developers test their apps on a physical device, you can test many aspects of your apps without running your code on a device. (developer.amazon.com)
Run the code for Speed it up without showing the help video, and ask your pupils what they think the function of keys F and S should be (faster / slower). (discoveryeducation.co.uk)
The tape itself will store only a simple running code which will identify it to the memory. (newscientist.com)