/wɒʃ seɪl/ – Phrase
Definition: giao dịch mua bán chứng khoán với mục đích tránh thuế hoặc tạo ra lợi ích không công bằng.
A more thorough explanation: the action of selling a security and then buying it again very shortly afterwards in order to claim the loss as a tax deduction
Example: The rule prohibits a taxpayer from claiming a loss on the sale or trade of a security in a wash sale.