Definition of add to phrasal verb from the Oxford Advanced American Dictionary

 

add to

 phrasal verb
phrasal verb
 
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Phrasal Verbs

add to something

 
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to increase something in size, number, amount, etc. The bad weather only added to our difficulties. The house has been added onto (= new rooms, etc. have been built on to it) from time to time.
See the Oxford Advanced Learner's Dictionary entry: add to