/drɛs daʊn ˈfraɪdeɪ/ – Phrase
Definition: Ngày thứ Sáu mặc đồ thoải mái (trong môi trường làm việc).
A more thorough explanation: (UK) in some law firms and other organizations, a day (usually a Friday) when lawyers and other employees can wear more informal clothes instead of business clothes
Example: The adoption of dress-down Friday has become commonplace in commercial law firms in the UK.