The document discusses various common idioms and their meanings, including:
- Couch potato - someone who watches a lot of TV and does not have an active life.
- Egghead - a very intelligent person focused only on studying.
- Raining cats and dogs - raining very heavily.
It provides example sentences using the idioms and asks the reader to match each idiom with its definition. Key idioms covered include burning bridges, costing an arm and a leg, cat got your tongue, speak of the devil, smelling a rat, burning the midnight oil, and once in a blue moon.