how to remove origin of a branch in git code example

Example 1: delete local and remote branch github

$ git push <remote_name> :<branch_name>

Example 2: How to Delete Local/Remote Git Branches

$ git branch -a

# *master
# b1
# remote/origin/master
# remote/origin/b1

$ git push origin --delete b1
# [...]
# - [deleted] b1