To Dilate

1. (transitive) To enlarge; to make bigger.

2. (intransitive) To become wider or larger; to expand.

3. (transitive, intransitive) To speak largely and copiously; to dwell in narration; to enlarge; with "on" or "upon".
4. (medicine, transitive, intransitive) To use a dilator to widen (something, such as a vagina).