a backseat driver

解析：字面意思是“坐在后排的驾驶员”。本来坐在后排的驾驶员应该是乘客，但是有时候乘客多嘴，告诉司机怎么开车。后来人们就把这样的人说成是“坐在后排的司机”，比喻多嘴多舌的人，多事的人。

例句：To avoid being a backseat driver, I keep my mouth shut.为了避免乱出主意，我只好闭嘴。
I detest his grandmother because she is a Backseat driver.我讨厌他的祖母,因为她多管闲事。

情景对话：

A : How many cleaning ladies does your company hire?

B : We have two cleaning ladies. But both of them have received little education.

A : Most cleaning ladies are illiterate. But some of them do a very nice job.

B : But I actually dislike another lazy. She is more capable and seems to have ideas of her own. But the trouble is she isa backseat driverwith some of us. She would tell you what to do and where to put things.

参考翻译：

A : 你们公司雇了多少员工？

B : 雇了2个。但他们都没受过多少教育。

A : 多数清洁工都没文化，但是工作干得不错。

B : 但我确实不喜欢另一个清洁工。她很能干，似乎也有自己的想法。可是她爱对我们指手画脚，总该告诉我们该做什么，东西该放哪儿。