Meaning of tack sth on In English

• 0 to add something that you had not planned to add, often without much preparation or thought:

  • At the last minute they tacked on a couple of extra visits to my schedule.

• 1 to add something extra to something:

  • Tacking a 32% surcharge on these products prices them out of U.S. markets.

  • He promised that he would tack labour and environmental clauses onto future trade deals.

• 2 to increase by a certain amount:

  • Wal-Mart tacked on $1.18, or 2.1% and was the Dow's biggest percentage gainer.

  • The Nasdaq tacked on 11.12 points or 0.81% to 1391.74.