EVERYDAY ENGLISH IDIOM: break down

break down is a most often used English idiom. break down means: coming to a stop through something breaking; becoming useless or disabled; having engine trouble. In the Indonesian language, break down means: rusak; tidak berfungsi lagi; tidak jalan; mogok (untuk mobil atau motor).

Water got into the cylinders and the car broke down.
The lift broke down, so we have to come down by the steps.
The train broke down, and we had to wait for about two hours.

EVERYDAY ENGLISH IDIOM: behind somebody's back

behind somebody's back is an everyday English idiom. behind somebody's back means:  without somebody's knowledge (in connection with something unpleasant); treacherously when one is unaware of what is being done or said. In the Indonesian language, behind somebody's back means berbuat sesuatu atau berbicara secara diam-diam, di luar pengetahuan seseorang. To use behind somebody's back, you may change the word somebody's in behind somebody's back into my, your, his, her, our, their, its, (your teacher)'s, etc., depending on the person you mean in the sentence you make.

Example:

He is the kind of person who flatters you to your face, and then slanders you behind your back.

I think we should let him know about this. It seems impolite to go ahead behind his back.

Don't pass notes to one another behind your teacher's back.