Question 1

What does "add on" mean?

Accepted Answer

To include an extra charge or cost on top of an existing price.

Question 2

How do you use "add on" in a sentence?

Accepted Answer

The airline added on a fuel surcharge without telling us in advance.

Question 3

Is "add on" formal or informal?

Accepted Answer

"add on" is register-neutral — appropriate in both casual and formal contexts. Commonly used in commercial contexts (adding fees, features, or services) and in construction (adding an extension). The noun 'add-on' is very common in technology and retail. Separable: 'add a fee on' or 'add on a fee'.

add on

Expressions associées

Plus avec "on"