I. ˈhī-ˌbȯl noun
Date: 1895
1. : an iced drink containing liquor (as whiskey) and water or a carbonated beverage (as ginger ale) and served in a tall glass
2. : a railroad signal for a train to proceed at full speed
II. intransitive verb
Date: 1912
: to go at full or high speed
a highball ing express train