'sanction' means: a rule from the Pope or from the highest authority, about whether something is allowed or not allowed.
for example: allowed - NATO sanctioned the bombing in Libya.
not allowed - The U.S. is seeking sanctions against Iranian oil.
This blog is mainly to explain a different English language expression every day. Sometimes I post other stuff. I also have a YouTube channel which is mostly about computer software: https://www.youtube.com/englishspacedog