Collins COBUILD Advanced Learner's English Dictionary - add on

1. If one thing is added on to another, it is attached to the other thing, or is made a part of it. 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. PHRASAL VERB: usu passive, V P n, V-ed P 2. If you add on an extra amount or item to a list or total, you include it. Many loan application forms automatically add on insurance. PHRASAL VERB: V P n (not pron), also V n P