2 verb
1 [transitive always + adverb/preposition] to attach something to a wall, board etc, using a tack
tack something to something
A handwritten note was tacked to the wall.
2 [intransitive]TTW to change the course of a sailing ship so that the wind blows against its sails from the opposite direction
3 [transitive]DCDLH to fasten pieces of cloth together with long loose stitches, before sewing them

tack something ↔ on

phrasal verb
to add something new to something that is already complete, especially in a way that looks wrong or spoils the original thing:
a beautiful old house with a hideous modern extension tacked on at the back

Dictionary results for "tack"
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