add on add on /æd ɒn/

verb

1. () Make an addition  ( add on )
   make an addition
    Let's add on to this
   Let's add on to this
   
2. Add to the very end  ( add on , supplement , append , affix )
   add to the very end
    He appended a glossary to his novel where he used an invented language
   He appended a glossary to his novel where he used an invented language