- ace
- 1. mod. [of persons] best; top-rated.□ She is an ace reporter with the newspaper.□ Frank is an ace swimmer.2. n. one dollar.□ Give me an ace. I have to get some telephone change.□ It only costs an ace. Buy two.3. tv. to pass a test easily, with an A grade. (See also ace out.)□ Man, I really aced that test.□ I knew I wouldn’t ace it, but I never thought I’d flunk it!4. n. <a nickname for a foolish and ineffectual person.> (Sarcastic. Usually a term of address.)□ Hey, ace, hand me that monkey wrench—if you know what one is.□ Look, ace, you can’t expect to fix an engine without getting dirty.5. tv. to surpass someone or something; to beat someone or something; to ace someone out.□ The Japanese firm aced the Americans by getting the device onto the shelves first.□ Fred aced Tom in the contest for the best beard.
Dictionary of American slang and colloquial expressions. 2015.