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Related to tack on: roughshod, come in handy, refer to, change tack
tack on somethingalso 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.
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.