What part of speech is dressed to the nines?

"Dressed to the nines" is a phrase, functioning as an adjective in a sentence.

Here's why:

* Phrase: It's a group of words that work together to convey a single idea.

* Adjective: It describes a noun or pronoun.

Example:

* The guests were dressed to the nines for the gala.

In this example, "dressed to the nines" describes the noun "guests" and tells us how they were dressed.