An idiom is a phrase or expression that has a figurative meaning that is different from the literal meaning of the individual words.
Examples:
* "Kick the bucket" - This idiom means "to die," even though it doesn't literally involve kicking a bucket.
* "Spill the beans" - This idiom means "to reveal a secret," even though it doesn't literally involve beans.
* "Break a leg" - This idiom is used to wish someone good luck, despite its seemingly negative literal meaning.
These are just a few examples of idioms. They are common in everyday language and can be confusing for non-native speakers.