Unergative verb

Definition
Unergative verb is a special kind of intransitive verb. Semantically, unergative verbs have a subject perceived as actively initiating or actively responsible for the action expressed by the verb.

Example
In English run, talk and resign are unergative verbs. In syntax, unergative verbs are characterized as verbs with an external argument. See unaccusative verb.

Links

 * Utrecht Lexicon of Linguistics