To Explain

1. To make plain, manifest, or intelligible; to clear of obscurity; to illustrate the meaning of.
2. To give a valid excuse for past behavior.
3. (obsolete) To make flat, smooth out.
4. (obsolete) To unfold or make visible.
5. (intransitive) To make something plain or intelligible.

(give a sufficiently detailed report): expound, elaborate, recce