Idioms (A, B)

An idiom has _______________ meaning from the literal (actual) meaning of the words

I always hit the books right before my exam.

What does the underlined idiom mean?

Kali got up late in the morning. He caught the school bus by the skin of his teeth.

What does this mean?

This is an important decision, I think I'll sleep on it.

What does the underlined idiom mean?

We have to sit tight till the pandemic is over.

What does the underlined idiom mean?

Learning English is a piece of cake!

What does this mean?