Slang vs Idioms: What Is the Difference?
Understand how slang and idioms overlap, and why both matter for casual English.
Slang
Slang is informal language used by groups of speakers. It can change quickly, and it often shows identity, age, mood, or social context.
Examples include no cap, sus, flex, and ghosted. These words are common in casual speech and online spaces.
Idioms
An idiom is a phrase whose meaning is not obvious from the individual words. For example, call it a day means stop working for now.
Idioms can be informal or formal. Some are very old, while slang often changes faster.
Why They Overlap
Many casual phrases are both idiom-like and slang-like. Hit me up means contact me, and spill the tea means share gossip. Their meanings are not literal, and they are also informal.
The practical question is not always What label is this? A better question is When does this phrase sound natural?