1. mod. [of persons] best; top-rated. She is an ace reporter with the newspaper.
2. n. one dollar. It only costs an ace. Buy two.
3. tv. to pass a test easily, with an A grade. (see also
ace out.)
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.
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.