The antipassive voice (abbreviated or ) is a type of grammatical voice that either does not include the object or includes the object in an oblique case. This construction is similar to the passive voice, in that it decreases the verb's valency by one - the passive by deleting the subject (and "promoting" the accusative object to a nominative subject), the antipassive by deleting the object (and "promoting" the ergative agent to an absolutive subject).