Also found in: Idioms.
Mack(măk), Connie Originally Cornelius McGillicuddy. 1862-1956.
American baseball player and manager (1901-1950) of the Philadelphia Athletics, which he led to nine American League pennants and five World Series championships between 1902 and 1931.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.