to say officially that something, especially an earlier official decision, is no longer to be accept

中文解释

撤销，废止，宣布…无效 His conviction was quashed in March 1986 after his counsel argued that the police evidence was all lies. 他的辩护人举证说明了警方的证据是一派谎言，于是对他的判决于1986年3月被撤销了。