How to sign: extend in one or more directions
"The dough expands";
Similiar / Same: spread out
Categories: grow
Within this category: bush out, dispread
How to sign: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
"She elaborated on the main ideas in her dissertation";
Similiar / Same: elaborate, lucubrate, expatiate, expound, exposit, flesh out, dilate, enlarge