出乱子的英文：
run off the rails

参考例句：

That would lead to disturbances.
就可能出乱子。

A presentiment of trouble ahead
要出乱子的预感.

Hung-chien relaxed somewhat and said obligingly, There's always trouble with mail between the interior and Shanghai
鸿渐稍微放心，迎合道:“内地跟上海的信，常出乱子。

run是什么意思：
n. 奔跑，跑步；旅行；趋势
v. 跑步，奔跑；逃跑；参赛；行驶；运转；（使）流动；管理

run the rapids.
冲过急流

Run (or Hold) with the hare and hunt (or run) with the hounds
两面讨好

Hold (or Run) with the hare and run (or hunt) with the hounds
两面讨好

off是什么意思：
adv. 掉，下；离开；隔开；切断；停止；；休息；光，完，尽；全部地
prep. 从...离开；从...向下；在...的外面；偏离...；从...分岔；不再从事...；低于...
adj. 关着的；停止流通的；延期的；取消的；不工作的；处于...境况的；萧条的
v.（用于祈使句）走开，滚开；站开
n. 关掉

Is the water on or off?
自来水龙头开着还是关着？

The gilt is off.
幻想破灭了。

to nip off; to cut off; to break
掐断

rails是什么意思：
n. 铁轨；横杆，扶手；抱怨，痛斥

To supply or enclose with rails or a rail.
用栏杆围提供栏杆或把栏杆围起来

The coal will be shipped by rail.
这些煤将用火车装运。

Trains run on rails.
火车在轨道上行驶。