An ergative verb is a verb that can be both transitive and intransitive, where the subject of the intransitive verb is
the same as the object of the transitive verb. For example, 'open' is an ergative verb because you can say 'The door opened' or 'She opened the door'.
designating, of, or in the case that is taken by the subject of a transitive verb in some languages,
as Basque or Georgian, in which the direct object of a transitive verb and the subject of the related intransitive
share the same case
designating or of a verb or language whose transitive and intransitive uses are related
in this way