add on - definition and synonyms

phrasal verb [transitive]
present tense
I/you/we/theyadd on
he/she/itadds on
present participleadding on
past tenseadded on
past participleadded on
  1. 1
    to include an extra thing or amount in something

    The referee added on eight minutes of injury time.

  2. 2
    American to build an extra part onto a building

    They refurbished the whole place and even added on.

See also
See also main entry: add