Definition of "tack on" []

• Fix to; attach (verb)

WordNet. Princeton University. 2010.

• "Inducing Mauer to hit a broken-bat grounder to first, the greatest closer in baseball history watched the Yankees tack on two insurance runs in the ninth ; the courtesy of three walks and bases-loaded RBI singles by Posada and Robinson Cano off a still shell-shocked Joe Nathan."
• "I will bury the lengths in gravel until they are four inches below the level of the yard and tack on landscaping cloth, a fine-weave nylon fabric."
• "On his good days, he was General Douglas McArthur, the fearless leader that produced sixteen divisional championships tack on two wildcard postseason berths, in 1995 and 2007, eleven American League Pennants and seven Commissioner’s trophies."