An "ergative verb" is a verb that can either take two nouns (a subject and an object) or only one (a subject), where the object of the two-noun form corresponds to the subject of the one-noun form.
That sounds more complicated than it is: an easy example is "break" in English. If used with only one noun, the subject is the thing that breaks: "the window broke". But if used with two nouns, the object is the thing that breaks: "Marcus broke the window".
Does Latin have any verbs which can interchange the roles of their subject and object like this?