Summer is here for those of us in the Northern Hemisphere, and things are starting to “heat up.” So for today’s lesson, we will look at various heat- and temperature-related phrasal verbs and idiomatic expressions. English has scores of expressions that include the words “heat,” “hot,” “cold,” “warm,” and “cool,” but for this lesson, we will concentrate on only the most common—the ones you are most likely to hear on TV and in movies, see in books and magazines, and come across in everyday conversation: the ones you will want to try out for yourself right away.