IDA pro取消定义字节（Undefine a byte）

Action    name: MakeUnknown

This command deletes the current instruction or data, converting it to 'unexplored' bytes. IDA will delete the subsequent instructions if there are no more references to them (functions are never deleted).
If you have selected a range using the anchor, all the bytes in this range will be converted into 'unexplored' bytes. In this case, IDA will not delete any other instructions even if there are no references to them after the deletion.

See also Edit submenu

中文翻译：

操作名称：MakeUnknown
此命令删除当前指令或数据，将其转换为“未探索”字节。如果不再引用后续指令（函数永远不会删除），IDA将删除这些指令。

如果您使用锚点选择了一个范围，则该范围中的所有字节都
将转换为“未探索”字节。在这种情况下，IDA不会删除
任何其他指令，即使删除后没有引用它们。

另请参阅编辑子菜单