1. mixed drinks consisting of a spirit served with ice and a mixer (such as soda water) in a tall glass
2. railroad signals indicating that a train should proceed at full speed
Usage: railroad terminology

Examples

• The bartender served whiskey highballs to the customers at the bar.
• She ordered two gin highballs with tonic water.
• The party featured various highballs and cocktails.
• The engineer received highballs from the signal tower.
• After getting the highballs, the train picked up speed.
• Classic highballs include whiskey and soda or rum and cola.