tack sth on
phrasal verb with tack verb [ T ] uk/tæk/ us
(also tack sth onto sth)
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.
STOCK MARKET informal
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.