/ˈɑbsəˌliːt ruːl/ – Phrase
Definition: quy tắc đã lỗi thời.
A more thorough explanation: An “obsolete rule” refers to a regulation, principle, or standard that is no longer in use or considered valid due to changes in circumstances, laws, or societal norms.
Example: The court found that the statute imposing a tax on horse-drawn carriages was an obsolete rule that no longer served a legitimate purpose in modern society.