Definition of add verb from the Oxford Advanced American Dictionary

      

    add

     verb
    verb
    NAmE//æd//
     
    Verb Forms present simple I / you / we / they add
     
    he / she / it adds
     
    past simple added
     
    -ing form adding
     
     
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  1. 1[transitive] to put something together with something else so as to increase the size, number, amount, etc. add something Next add the flour. The juice contains no added sugar. The plan has the added (= extra) advantage of bringing employment to rural areas. add something to something A new wing was added to the building. Shall I add your name to the list? Chlorine is added to the water to kill bacteria.
  2. 2 [intransitive, transitive] to put numbers or amounts together to get a total add A to B Add 9 to the total. add A and B together If you add all these amounts together, you get a huge figure. opposite subtract
  3. 3[transitive] to say something more; to make a further remark + speech “And don't be late,” she added. add something (to something) I have nothing to add to my earlier statement. add that… He added that they would return a week later.
  4. 4 [transitive] add something (to something) to give a particular quality to an event, a situation, etc. This necklace will add a little class to your outfit.
  5. Idioms
    added to this…,add to this…
     
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    used to introduce another fact that helps to emphasize a point you have already made Add to this the excellent service, and you can see why it's the most popular hotel on the island.
    add insult to injury
     
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    to make a bad relationship with someone worse by offending them even more
    Phrasal Verbsadd somethinginadd somethingon (to something)add to somethingadd upadd upadd up to something
See the Oxford Advanced Learner's Dictionary entry: add