The book follows the famous Cambridge "In Use" format: a where the left-hand page explains the idioms, and the right-hand page provides practice exercises.
By next month, when someone says "I’m feeling under the weather," you won't look outside for a storm. You'll just smile and say, "I hope you feel better."
," there is a widely used textbook by that name, as well as several research papers investigating how elementary-level learners acquire and use idioms. Textbook: English Idioms in Use (Elementary/Intermediate)