Imagine, for a moment, that you went to watch a movie. Your friend is thinking about going to see it and she asks you what it was like. You could answer "It was exciting", but that would be a boring way to describe it. Make your English more interesting by using one of these well-known idioms.
When something keeps you on the edge of your seat, it's very exciting and you want to know what is going to happen next.
A nail-biting event makes you feel very nervous, usually because you are waiting for something important to happen. It the case of a movie, you really want to see what happens next.
Something that is very, very boring can be described as about as exciting as watching paint dry.
Just like the expression above, this is used to describe something that is very uninteresting.
Can you think of any example sentences using the above expressions?