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tack on

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tack on something

also tack something on

to add something that is extra or does not belong When we got the bill there was an extra 18% tacked on as a service charge. You should ask that question at the meeting and not tack it on to an e-mail.

See also: on, tack

tack on

v.

1. To attach something to a surface using a tack, pin, or nail: I tack my children's drawings on the kitchen door. The teacher set up a big corkboard, and each child tacked on a poem.

2. To add or append something additional: The hotel tacked on a five percent service fee. I read my essay again and tacked an introduction on.

See also: on, tack