Here's a breakdown:
* "Paper": Refers to a document, usually a written agreement or contract.
* "Worth": Implies value, importance, or significance.
* "Not worth": Indicates a lack of value or significance.
Meaning: The phrase suggests that the document or agreement is so flimsy, unreliable, or meaningless that it's not even worth the physical material it's printed on. It implies that the agreement will likely be broken or that the promises made within it are hollow.
Example: "The peace treaty they signed is not worth the paper it's written on. We all know they'll break it as soon as it's convenient."
Similar Idioms:
* A piece of paper
* Not worth the ink it's written in
* Empty promises
Let me know if you have any other phrases you'd like explained!