An ace on the line. Ace in the Line or Ace on the Line meant right on or Correct. A phrase used to state that a person(or group of people)has the upper hand. ExampleEdit "Hey they wont even see us coming, We really have the ace on the line here." Retrieved from "https://deathlands.fandom.com/wiki/ACE_IN_THE_LINE?oldid=7732" Categories: Phrases & Terminology Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.