Idiomatic expression and Tag

Idiomatic expression noun - An expression whose meanings cannot be inferred from the meanings of the words that make it up.

Tag and idiomatic expression are semantically related. In some cases you can use "Tag" instead a noun phrase "Idiomatic expression".

Tag noun - A slip (as of paper or cloth) that is attached to something to identify or describe it.

Idiomatic expression and tag are semantically related. Sometimes you can use "Idiomatic expression" instead a noun "Tag".