Remove a Local Docker Image Tag Without Deleting the Image

I'm new on the containers world and I recently have started with Docker. But I'm having some issues, and I couldn't find a solution ( at least one I understand minimally). So, here's the problem:

• I want to delete a local image tag ("repository"/"tag" combination). Is it possible?
• How can I, having multiple TAGs associated with just one image ID, delete any of these TAGs without deleting the others? In my case, I just wanna to exclude the hiworld repository. I'm able to delete the image and therefore all the TAGs associated with, but this is not what I want to do. Below is what is displayed when I enter the command docker images.

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
helloworld1         latest              8916c2510f76        3 hours ago         148MB
hiworld             latest              8916c2510f76        3 hours ago         148MB

Thanks in advance.

docker rmi (the remove image command) does this.

$ docker rmi hiworld:latest

That will untag hiworld:latest, but will leave helloworld1:latest (and 8916c2510f76) in place. According to the docs,

If an image has one or more tags referencing it, you must remove all of them before the image is removed.