The document discusses many English idioms and expressions related to weather. It provides the meaning and examples of common sayings like "under the weather" (feeling unwell), "fair-weather friend" (someone who is only friendly when things are going well), and "as right as rain" (feeling completely better). It also covers expressions involving types of weather like "raining cats and dogs" (raining very heavily) or situations involving weather like "save for a rainy day" (saving money for unexpected future needs).