ergative verb

In general linguistics, a labile verb (or ergative verb) is a verb that undergoes causative alternation; that is, it can be used both transitively and intransitively, with the requirement that the direct object of its transitive use corresponds to the subject of its intransitive use, as in "I ring the bell" and "The bell rings." Labile verbs are a prominent feature of English, but they also occur in many other languages. When causatively alternating verbs are used transitively they are called causatives since, in the transitive use of the verb, the subject is causing the action denoted by the intransitive version. When causatively alternating verbs are used intransitively, they are referred to as anticausatives or inchoatives because the intransitive variant describes a situation in which the theme participant (in this case "the door") undergoes a change of state, becoming, for example, "opened". Terminology The terminology in general linguistics is not stable yet. Labile verbs can also be called "S=O-ambitransitive" (following R.M.W. Dixon's usage), or "ergative", following Lyons's influential textbook from 1968. However, the term "ergative verb" has also been used for unaccusative verbs, and in most other contexts, it is used for ergative constructions. In English Most English verbs can be used intransitively, but ordinarily this does not change the role of the subject; consider, for example, "He ate the soup" (transitive) and "He ate" (intransitive), where the only difference is that the latter does not specify what was eaten. By contrast, with a labile verb the role of the subject changes; consider "it broke the window" (transitive) and "the window broke" (intransitive). Labile verbs can be divided into several categories: Verbs suggesting a change of state — break, burst, form, heal, melt, tear, transform Verbs of cooking — bake, boil, cook, fry Verbs of movement — move, shake, sweep, turn, walk Verbs involving vehicles — drive, fly, reverse, run, sail