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

build onto

phrasal verb
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build something on | build something onto something
  1. 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.
trait
noun
 
 
From the Word list
Oxford 5000
B2
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