expand the influence of
"The King extended his rule to the Eastern part of the continent"
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"
- flesh out
exaggerate or make bigger
"The charges were inflated"
- blow up
"The deer population in this town is thriving"
"business is booming"
make bigger or wider in size, volume, or quantity
"expand the house by adding another wing"
become larger in size or volume or quantity
"his business expanded rapidly"
extend in one or more directions
"The dough expands"
- spread out