An intransitive clause is a °clause which is not °transitive, i.e. which does not contain two °argument positions that are coded in the same way as the arguments of the verbs 'kill' and/or 'break'.
Intransitive clauses need not be monovalent (contra Croft's definition), because they can contain an oblique argument in addition to the S-argument.
intransitive construction (CXN) = the construction, or possibly set of constructions, used to express monovalent events with their single salient argument, in the S role. Example: The boys walked is an example of an English intransitive construction. Unlike the transitive construction and the ditransitive construction, there is no clear exemplar event for defining intransitive constructions, thanks to the existence of active align- ment. (Sections 6.1.2, 6.3.3)