Simple and compound idioms

[Monaalnomassy]

What is meant by the terms simple and compound idioms? I conducted intensive research, but unfortunately I found nothing? I have a research on this topic?
regards

 

[5jj]

I have been involved in language learning and teaching for many years, but I have not heard of simple or compound idioms.

 

[MikeNewYork]

Nor have I.

 

[5jj]

The people in the other forum where you asked this question can't help either. Perhaps it's time to go back to the person who set you this task and ask him what he is talking about.