Definition of build on phrasal verb from the Oxford Advanced Learner's Dictionary

 

build on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to use something as a basis for further progress This study builds on earlier work. We will continue to build on our previous success.

build something on something

 
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[usually passive] to base something on something an argument built on sound logic

build somethingon

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build something onto something

 
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to add something (for example, an extra room) to an existing structure by building They've built an extension on. The new wing was built onto the hospital last year.
See the Oxford Advanced American Dictionary entry: build on