The watch just doesn't work .Something must have gone ------

go wrong 坏了,出现故障了；犯错误; 做错事
没什么好说的,习惯用法.注意,这里的wrong为副词
例如：
the radio has gone wrong. 收音机坏了
If you read the instructions, you'll see where you went wrong. 你要是看一下说明书就知道你错在哪儿了.
You can't go wrong with our new carpet cleaner. 使用我们新型的地毯吸尘器绝对不会出错.