Here's a breakdown of the phrase:
* Acabas: This is the second-person singular form of the verb "acabar," which means "to finish" or "to end." It's conjugated in the present tense.
* De: This is the preposition "of," indicating the action that was just finished.
* Hacer: This is the verb "to do."
Example:
* "¿Qué acabas de hacer?" (What did you just do?)
* "Acabo de comer." (I just ate.)
It emphasizes that the action occurred very recently, often moments ago.