add on
A2 neutral separable transitive
In simple words
To put something extra on top of or alongside something that is already there.
Literal meaning: To place something additional on top of or alongside something — very transparent.
Meanings
1 A2 neutral
To include an extra charge or cost on top of an existing price.
"The airline added on a fuel surcharge without telling us in advance."
Grammar: separable
2 A2 neutral
To attach an extra feature, room, or component to something existing.
"They added a garage on to the side of the house last summer."
Grammar: separable
Usage notes
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'.
Commonly used with
fee cost feature service extension charge
Forms
Base
add on
I/you/we/they
3rd person
adds on
he/she/it
Past simple
added on
yesterday
Past participle
added on
have + pp
-ing form
adding on
continuous
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Synonyms
attach append include tack on supplement annex
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