(transitive) to extend, expand, enlarge
(transitive) to broaden, to widen, to further
(transitive) to elaborate on, to expand on
(transitive) to magnify, to blow up, to enlarge, to scale up (e.g. a photograph, a model)
(reflexive) to expand, to extend (itself, oneself)
(reflexive) to be extended, to be expanded, to be broadened, to be enlarged, to be widened, to be increased, to be scaled up