This is a slideshow I used to teach these idioms; however, I also printed this out for the students to write their own sentences using each idiom. Then, they would draw a picture of what the idiom would look like in real life. This is the list from the Core Knowledge book.
When teaching these, we read them aloud and discuss them. I give several examples of when I might use these idioms, and then I turn them loose to interpret it. Then, we move onto the next slide. I have allowed them to work ahead and then go back over what we've done. Having students share their sentences give me a spot check on comprehension, and I can reteach if they got the wrong idea.
My favorite example in conversation is "You're on Fire," when teaching idioms. In your mind, you might think of flames all over yourself; however, it just means you're doing an amazing job. Drawing a picture of what the idiom actually means helps cement what the phrase actually means.
This can be done with a partner or in a group, but it is important for the children to come up with their own drawings.