UntagResource
Use the UntagResource API operation to remove a tag from a resource. 
                Before you do so, you can call the ListTagsForResource API operation to list the tags assigned to a resource.
Following
            is an example AWS CLI command for this operation. To find a resource’s Amazon Resource
            Name (ARN), use the List operation for the resource, for example
                ListDashboards.
For more information about the UntagResource API operation, see UntagResource in the Amazon Quick Sight API Reference.