Dic: add to, add on (to)

• This latest incident will add to the pressure on the government.
• Holidaymakers can also add on a week in Majorca before or after the cruise.
• To the rear is a large dining room added on early this century.
• Many loan application forms automatically add on insurance.

add to | If one thing adds to another, it makes the other thing greater in degree or amount.

add on :

1. PHRASAL VERB : usu passive | If one thing is added on to another, it is attached to the other thing, or is made a part of it.

2. PHRASAL VERB | If you add on an extra amount or item to a list or total, you include it.

.... Cobuild