to increase the size, extent, number, volume, or scope of (something)
The company has expanded its interests overseas
to express (something) in detail or in full
You will have to expand your argument
to express (something) in fuller mathematical form, esp as the sum of many terms of a series
to become larger, greater, etc; to be expanded
Iron expands when heated
to unfold or open out
to express in detail or in full
(often + on) to speak or write at length; to enlarge
Please expand on this passage
to grow genial; to become more sociable
She only expands among friends
expandable adj
expander noun
[Middle English expaunden from Latin expandere, from ex-1 + pandere to spread]