a manually operated device to correct the operation of an automatic device
the act of nullifying; making null and void; counteracting or overriding the effect or force of something
例句
Considerations of safety override all other concerns.对安全的考虑压倒一切。
A particular value for a variable that is assigned automatically by an operating system and remains in effect unless canceled or overridden by the operator.缺省，默认某一变量的特定值，由操作系统自动指定并持续有效，除非操作者取消它或使它无效
