Longman Dictionary of Contemporary English homepage

Topic: CHEMISTRY

Date: 1400-1500
Language: Latin
Origin: expandere, from pandere 'to spread'

expand

verb
     
ex‧pand S2 W3
1 [intransitive and transitive] to become larger in size, number, or amount, or to make something become larger [↪ expansion; ≠ contract]:
Water expands as it freezes.
Sydney's population expanded rapidly in the 1960s.
exercises that expand the chest muscles
his expanding waistline
2 [intransitive and transitive] if a company, business etc expands, or if someone expands it, they open new shops, factories etc [↪ expansion]:
The computer industry has expanded greatly over the last decade.
The hotel wants to expand its business by adding a swimming pool.
the rapidly expanding field of information technology
expand into
We have plans to expand into the U.S. market.
3 [intransitive] literary to become more confident and start to talk more:
After a few whiskies he started to expand a little.

expand on/upon something

phrasal verb
to add more details or information to something that you have already said:
Payne later expanded on his initial statement.
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